Overload so the compiler can validate the passed type

Author: shana

src/GitHub.Exports/Services/IUIProvider.cs

@@ -18,6 +18,7 @@ public interface IUIProvider : IServiceProvider
         T TryGetService<T>() where T : class;
 
         void AddService(Type t, object instance);
+        void AddService<T>(T instance);
         void RemoveService(Type t);
 
         IObservable<UserControl> SetupUI(UIControllerFlow controllerFlow, IConnection connection);

src/GitHub.VisualStudio/Services/UIProvider.cs

@@ -144,6 +144,11 @@ public Ret GetService<T, Ret>() where Ret : class
             return GetService<T>() as Ret;
         }
 
+        public void AddService<T>(T instance)
+        {
+            AddService(typeof(T), instance);
+        }
+
         public void AddService(Type t, object instance)
         {
             if (!Initialized)