Added help for contributors to the Sentry.Bindings.Android readme (#3514

)

src/Sentry.Bindings.Android/README.md

@@ -3,3 +3,11 @@ Instead, reference one of the following:
 
 - [`Sentry.Maui`](https://www.nuget.org/packages/Sentry.Maui) - if you are using .NET MAUI
 - [`Sentry`](https://www.nuget.org/packages/Sentry) - if you are authoring a .NET Android application without using MAUI
+
+## SDK Developers and Contributors
+
+For .NET SDK contributors, most of the classes in this package are generated automatically by proguard.
+
+- Proguard configuration is defined in `sentry-proguard.cfg` (see [Proguard usage](https://www.guardsquare.com/manual/configuration/usage))
+
+- Post generation transformations are controlled via various XML files stored in the `/Transforms` directory  (see [Java Bindings Metadata documentation](https://learn.microsoft.com/en-gb/previous-versions/xamarin/android/platform/binding-java-library/customizing-bindings/java-bindings-metadata) for details).