diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..5844c61
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Macocian Alexandru Victor
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Slim/Slim.csproj b/Slim/Slim.csproj
index aed060a..afc9a3a 100644
--- a/Slim/Slim.csproj
+++ b/Slim/Slim.csproj
@@ -7,16 +7,25 @@
     <Company />
     <Product></Product>
     <Description>Service lifetime management and dependency injection framework.</Description>
-    <AssemblyVersion>1.0.2.0</AssemblyVersion>
-    <FileVersion>1.0.2.0</FileVersion>
+    <AssemblyVersion>1.0.2.1</AssemblyVersion>
+    <FileVersion>1.0.2.1</FileVersion>
     <PackageProjectUrl>https://github.com/AlexMacocian/Slim</PackageProjectUrl>
-    <Version>1.2.0</Version>
+    <Version>1.2.1</Version>
     <EnforceCodeStyleInBuild>true</EnforceCodeStyleInBuild>
     <EnableNETAnalyzers>true</EnableNETAnalyzers>
+    <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
+    <PackageLicenseFile>LICENSE</PackageLicenseFile>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
     <DocumentationFile>C:\Users\Owner\source\repos\Slim\Slim\Slim.xml</DocumentationFile>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="..\LICENSE">
+      <Pack>True</Pack>
+      <PackagePath></PackagePath>
+    </None>
+  </ItemGroup>
+
 </Project>
diff --git a/Slim/Slim.xml b/Slim/Slim.xml
index 81b96ff..7171a55 100644
--- a/Slim/Slim.xml
+++ b/Slim/Slim.xml
@@ -9,6 +9,17 @@
             Interface for <see cref="T:Slim.ServiceManager"/>.
             </summary>
         </member>
+        <member name="M:Slim.IServiceManager.RegisterServiceManager">
+            <summary>
+            Register the current service manager as a valid dependency.
+            </summary>
+            <remarks>Same functionality as calling <see cref="M:Slim.IServiceProducer.RegisterSingleton(System.Type,System.Func{Slim.IServiceProvider,System.Object})" /> with current <see cref="T:Slim.IServiceManager"/>.</remarks>
+        </member>
+        <member name="M:Slim.IServiceManager.BuildSingletons">
+            <summary>
+            Builds all registered singletons.
+            </summary>
+        </member>
         <member name="M:Slim.IServiceManager.HandleException``1(System.Func{Slim.IServiceProvider,``0,System.Boolean})">
             <summary>
             Marks a type of exception to be caught and handled.
@@ -31,13 +42,48 @@
             Interface allowing to produce services for the <see cref="T:Slim.ServiceManager"/>.
             </summary>
         </member>
+        <member name="M:Slim.IServiceProducer.RegisterSingleton``1">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterSingleton``1(System.Func{Slim.IServiceProvider,``0})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <param name="serviceFactory">Factory for the implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterTransient``1">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterTransient``1(System.Func{Slim.IServiceProvider,``0})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <param name="serviceFactory">Factory for the implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
         <member name="M:Slim.IServiceProducer.RegisterTransient``2">
             <summary>
             Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
             </summary>
             <typeparam name="TInterface">Type of interface.</typeparam>
             <typeparam name="TClass">Type of implementation.</typeparam>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.IServiceProducer.RegisterTransient``2(System.Func{Slim.IServiceProvider,``1})">
@@ -56,7 +102,6 @@
             </summary>
             <typeparam name="TInterface">Type of interface.</typeparam>
             <typeparam name="TClass">Type of implementation.</typeparam>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.IServiceProducer.RegisterSingleton``2(System.Func{Slim.IServiceProvider,``1})">
@@ -75,7 +120,6 @@
             </summary>
             <param name="tInterface">Type of interface.</param>
             <param name="tClass">Type of implementation.</param>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.IServiceProducer.RegisterTransient(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
@@ -94,10 +138,9 @@
             </summary>
             <param name="tInterface">Type of interface.</param>
             <param name="tClass">Type of implementation.</param>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
-        <member name="M:Slim.IServiceProducer.RegisterSingleton``2(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+        <member name="M:Slim.IServiceProducer.RegisterSingleton(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
             <summary>
             Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
             </summary>
@@ -107,6 +150,42 @@
             <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
+        <member name="M:Slim.IServiceProducer.RegisterTransient(System.Type)">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterTransient(System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <param name="serviceFactory">Factory for implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterSingleton(System.Type)">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.IServiceProducer.RegisterSingleton(System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <param name="serviceFactory">Factory for implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
         <member name="T:Slim.IServiceProvider">
             <summary>
             Interface allowing to request services from the <see cref="T:Slim.ServiceManager"/>.
@@ -139,7 +218,6 @@
             </summary>
             <typeparam name="TInterface">Type of interface.</typeparam>
             <typeparam name="TClass">Type of implementation.</typeparam>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.ServiceManager.RegisterTransient``2(System.Func{Slim.IServiceProvider,``1})">
@@ -158,7 +236,6 @@
             </summary>
             <typeparam name="TInterface">Type of interface.</typeparam>
             <typeparam name="TClass">Type of implementation.</typeparam>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.ServiceManager.RegisterSingleton``2(System.Func{Slim.IServiceProvider,``1})">
@@ -177,7 +254,6 @@
             </summary>
             <param name="tInterface">Type of interface.</param>
             <param name="tClass">Type of implementation.</param>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
         <member name="M:Slim.ServiceManager.RegisterTransient(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
@@ -196,10 +272,9 @@
             </summary>
             <param name="tInterface">Type of interface.</param>
             <param name="tClass">Type of implementation.</param>
-            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
-        <member name="M:Slim.ServiceManager.RegisterSingleton``2(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+        <member name="M:Slim.ServiceManager.RegisterSingleton(System.Type,System.Type,System.Func{Slim.IServiceProvider,System.Object})">
             <summary>
             Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
             </summary>
@@ -209,6 +284,84 @@
             <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
             <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
         </member>
+        <member name="M:Slim.ServiceManager.RegisterSingleton``1">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterSingleton``1(System.Func{Slim.IServiceProvider,``0})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <param name="serviceFactory">Factory for the implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterTransient``1">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterTransient``1(System.Func{Slim.IServiceProvider,``0})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <typeparam name="TClass">Type of implementation.</typeparam>
+            <param name="serviceFactory">Factory for the implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterTransient(System.Type)">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterTransient(System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Transient"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <param name="serviceFactory">Factory for implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterSingleton(System.Type)">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterSingleton(System.Type,System.Func{Slim.IServiceProvider,System.Object})">
+            <summary>
+            Register a service into <see cref="T:Slim.ServiceManager"/> with <see cref="F:Slim.Lifetime.Singleton"/>.
+            Registers the service for all interfaces it implements.
+            </summary>
+            <param name="tClass">Type of implementation.</param>
+            <param name="serviceFactory">Factory for implementation.</param>
+            <exception cref="T:System.ArgumentNullException">Thrown when the provided serviceFactory is null.</exception>
+            <exception cref="T:System.InvalidOperationException">Thrown when <see cref="T:Slim.ServiceManager"/> contains an entry for the provided interface type.</exception>
+        </member>
+        <member name="M:Slim.ServiceManager.RegisterServiceManager">
+            <summary>
+            Register the current service manager as a valid dependency.
+            </summary>
+            <remarks>Same functionality as calling <see cref="M:Slim.IServiceProducer.RegisterSingleton(System.Type,System.Func{Slim.IServiceProvider,System.Object})" /> with current <see cref="T:Slim.IServiceManager"/>.</remarks>
+        </member>
         <member name="M:Slim.ServiceManager.GetService``1">
             <summary>
             Resolves and returns the required service.
@@ -242,5 +395,10 @@
             Calls <see cref="M:System.IDisposable.Dispose"/> on all <see cref="T:System.IDisposable"/> singletons.
             </remarks>
         </member>
+        <member name="M:Slim.ServiceManager.BuildSingletons">
+            <summary>
+            Build all registered singletons.
+            </summary>
+        </member>
     </members>
 </doc>