Add AddControl method to ServiceCollectionExtensions

This method allows registering controls with the IServiceCollection. It uses a generic type parameter to add transient services for controls.

Frank.Wpf.Hosting/ServiceCollectionExtensions.cs

@@ -21,4 +21,10 @@ public static IServiceCollection AddWindow<T>(this IServiceCollection services)
         services.AddTransient<Window, T>(provider => provider.GetRequiredService<T>());
         return services;
     }
+
+    public static IServiceCollection AddControl<T>(this IServiceCollection services) where T : Control
+    {
+        services.AddTransient<T>();
+        return services;
+    }
 }