Add Release notes

Author: dellis1972

Documentation/release-notes/5327.md

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+### Build and deployment performance
+
+    * [GitHub PR 5327](https://github.com/xamarin/xamarin-android/pull/5327):
+      Allow users to specify additional app bundle "modules" when
+      building using `$(AndroidPackageFormat)` set to `aab`. In the
+      future this will help us support [Dynamic Features](https://developer.android.com/guide/app-bundle/play-feature-delivery)