Update README.md (#59)

Author: davidbritch

README.md

@@ -6,6 +6,7 @@ assemblies bundled with Xamarin.Android.
 
 [mdoc]: http://docs.go-mono.com/?link=man%3amdoc(5)
 
+Support for Xamarin ended on the 1st May 2024 and so this documentation won't be updated. For more information, see [Xamarin Support Policy](https://dotnet.microsoft.com/platform/support/policy/xamarin).
 
 Scripts included in the repository
 ----------------------------------
@@ -33,4 +34,4 @@ there. Macdoc is under the samples directory.
 ## Microsoft Open Source Code of Conduct
 
 This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
-For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [[email protected]](mailto:[email protected]) with any additional questions or comments.