Move all code to src/cs + move .sln to root of repository

src/cs/MonoGame.Extended.Collisions/QuadTree/QuadTreeData.cs

@@ -0,0 +1,65 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MonoGame.Extended.Collisions
+{
+    /// <summary>
+    ///     Data structure for the quad tree.
+    ///     Holds the entity and collision data for it.
+    /// </summary>
+    public class QuadtreeData
+    {
+        public QuadtreeData(ICollisionActor target)
+        {
+            Target = target;
+            Bounds = target.Bounds;
+        }
+
+        public void RemoveParent(Quadtree parent)
+        {
+            Parents.Remove(parent);
+        }
+
+        public void AddParent(Quadtree parent)
+        {
+            Parents.Add(parent);
+        }
+
+        public void RemoveFromAllParents()
+        {
+            foreach (Quadtree parent in Parents.ToList())
+            {
+                parent.Remove(this);
+            }
+            Parents.Clear();
+        }
+
+        public HashSet<Quadtree> Parents = new HashSet<Quadtree>();
+
+        /// <summary>
+        ///     Gets or sets the Target for collision.
+        /// </summary>
+        public ICollisionActor Target { get; set; }
+
+        /// <summary>
+        ///     Gets or sets whether Target has had its collision handled this
+        ///     iteration.
+        /// </summary>
+        public bool Dirty { get; private set; }
+
+        public void MarkDirty()
+        {
+            Dirty = true;
+        }
+
+        public void MarkClean()
+        {
+            Dirty = false;
+        }
+
+        /// <summary>
+        ///     Gets or sets the bounding box for collision detection.
+        /// </summary>
+        public IShapeF Bounds { get; set; }
+    }
+}