Add project files.

Framework/Core/LifeCycles/Scope.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Concurrent;
+using System.Reactive.Disposables;
+
+namespace TheXamlGuy.Framework.Core
+{
+    public class Scope : IScope
+    {
+        private readonly ConcurrentDictionary<object, bool> scopes = new ConcurrentDictionary<object, bool>();
+
+        public IDisposable Enter<T>(object target)
+        {
+            scopes.TryAdd(Tuple.Create(target, typeof(T)), true);
+            return Disposable.Create(() => scopes.TryRemove(Tuple.Create(target, typeof(T)), out bool value));
+        }
+
+        public bool IsActive<T>(object target)
+        {
+            return scopes.ContainsKey(Tuple.Create(target, typeof(T)));
+        }
+    }
+}