Add template README

template/README.md

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+# Get started with a new binding
+
+Get started by copying the contents of this template and following the instructions in the [documentation](https://learn.microsoft.com/dotnet/communitytoolkit/maui/native-library-interop/get-started).
+
+This template provides the boilerplate needed to get started with creating a new binding via Native Library Interop. It is organized by binding and platform, like all the other sample bindings in the repo:
+- **android**
+    - **NewBinding.Android.Binding** - the .NET API you will use
+    - **native** - the Android project with Java/Kotlin code exposing the API you will use
+- **macios**
+    - **NewBinding.MaciOS.Binding** - the .NET API you will use
+    - **native** - the Xcode project with Java/Kotlin code exposing the API you will use
+- **sample** - the .NET MAUI app showing the library in use