Update readme may 1 (#2137)

* Update README

* update

* update

* Add info about nuget

---------

Co-authored-by: Gerald Versluis <[email protected]>

Author: rachelkang

README.md

@@ -1,5 +1,25 @@
 # Xamarin.Essentials
 
+## Support
+
+Support for Xamarin.Essentials ended on **May 1, 2024** as per the [Xamarin Support Policy][xamarin-support-policy]:
+
+> Xamarin support ended on May 1, 2024 for all Xamarin SDKs including Xamarin.Forms.
+
+Xamarin.Forms was succeeded by .NET MAUI (which includes Essentials), in May 2022 as part of .NET 6, and is currently supported as described on the [.NET MAUI Support Policy][maui-support-policy]. Follow the [official upgrade guidance][maui-upgrade-guidance] to bring your Xamarin applications to the latest version of .NET.
+
+In addition to being part of .NET MAUI, Essentials is also available to use with your .NET apps via the [Maui.Essentials NuGet package][maui-essentials-nuget], which is supported in the latest two versions of .NET. 
+
+To all our developers and contributors, thank you so much for being a part of our Xamarin community. We'll see you all over in [.NET MAUI][dotnet-maui-repo]!
+
+[maui-support-policy]: https://dotnet.microsoft.com/platform/support/policy/maui
+[maui-upgrade-guidance]: https://learn.microsoft.com/dotnet/maui/migration
+[xamarin-support-policy]: https://dotnet.microsoft.com/platform/support/policy/xamarin
+[maui-essentials-nuget]: https://www.nuget.org/packages/Microsoft.Maui.Essentials
+[dotnet-maui-repo]:https://github.com/dotnet/maui/
+
+## About Xamarin.Essentials
+
 Xamarin.Essentials gives developers essential cross-platform APIs for their mobile applications. 
 
 iOS, Android, and UWP offer unique operating system and platform APIs that developers have access to, all in C# leveraging Xamarin. It is great that developers have 100% API access in C# with Xamarin, but these APIs are different per platform. This means developers have to learn three different APIs to access platform-specific features. With Xamarin.Essentials, developers have a single cross-platform API that works with any iOS, Android, or UWP application that can be accessed from shared code no matter how the user interface is created.