Update README.md

Author: Redth

README.md

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 Xamarin creates and maintains Xamarin.Android bindings for the Google Android Support Libraries and AndroidX.
 
+# AndroidX Roadmap
+To view our progress on AndroidX bindings and to see more information about our roadmap, check out the [AndroidX Branch](https://github.com/xamarin/AndroidSupportComponents/tree/AndroidX#android-support---androidx-roadmap)
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 ## Building
 
 Building from source requires calling the cake script: