Add archive note and new link

Author: mattwojo

docs/index.md

@@ -3,12 +3,13 @@ title: Windows Community Toolkit Documentation
 author: nmetulev
 ms.topic: overview
 description: The Windows Community Toolkit is a collection of helper functions, custom controls, and app services. It simplifies and demonstrates common developer tasks building UWP apps for Windows 10. 
-keywords: windows 10, uwp, windows community toolkit, uwp community toolkit, uwp toolkit
-ms.custom: RS5
 ---
 
 # Windows Community Toolkit Documentation
 
+> [!IMPORTANT]
+> This Windows Community Toolkit is moving to an archived state. See the updated [Windows Community Toolkit documentation](/dotnet/communitytoolkit/windows/) in the .NET guidance.
+
 The Windows Community Toolkit is a collection of helper functions, custom controls, and app services. It simplifies and demonstrates common developer tasks building UWP apps for Windows 10.
 
 The toolkit can be used to build apps for any Windows 10 device, including PC, Mobile, Xbox, IoT and HoloLens. You can also use the toolkit with an existing desktop app converted to UWP using the Desktop Bridge.