Add project files.

AspNetCore.Extensions/HttpContextExtensions.cs

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+using Microsoft.CorrelationVector;
+using System.Core.Extensions;
+
+namespace AspNetCore.Extensions;
+
+public static class HttpContextExtensions
+{
+    private const string CorrelationVectorKey = "CorrelationVector";
+
+    public static void SetCorrelationVector(this HttpContext context, CorrelationVector cv)
+    {
+        context.ThrowIfNull()
+            .Items.Add(CorrelationVectorKey, cv);
+    }
+
+    public static CorrelationVector GetCorrelationVector(this HttpContext context)
+    {
+        context.ThrowIfNull();
+        if (!context.Items.TryGetValue(CorrelationVectorKey, out var cvVal) ||
+            cvVal is not CorrelationVector cv)
+        {
+            throw new InvalidOperationException("Unable to extract API Key from context");
+        }
+
+        return cv;
+    }
+}