Add foundation

Toolkit.Foundation/ProxyServiceCollection.cs

@@ -0,0 +1,15 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Toolkit.Foundation;
+
+public class ProxyServiceCollection<T> :
+    IProxyServiceCollection<T>
+{
+    public ProxyServiceCollection(Action<IServiceCollection> configureDelegate)
+    {
+        Services = new ServiceCollection();
+        configureDelegate.Invoke(Services);
+    }
+
+    public IServiceCollection Services { get; private set; }
+}