[jnigen] Top level project information files (#6)

Author: mahesh-hegde

pkgs/jni_gen/AUTHORS

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-[![Build Status](https://github.com/dart-lang/jni_gen/workflows/Dart%20CI/badge.svg)](https://github.com/dart-lang/jni_gen/actions?query=workflow%3A%22Dart+CI%22+branch%3Amain)
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 # Experimental generator for FFI+JNI bindings.
 
 This package will generate JNI code to invoke Java from C, and Dart FFI bindings to invoke this C code.

pkgs/jni_gen/CONTRIBUTING.md

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+[![Build Status](https://github.com/dart-lang/jni_gen/workflows/Dart%20CI/badge.svg)](https://github.com/dart-lang/jni_gen/actions?query=workflow%3A%22Dart+CI%22+branch%3Amain)
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+## jni_gen
+
+This project intends to provide 2 packages to enable JNI interop from Dart & Flutter.
+
+| Package | Description |
+| ------- | --------- |
+| [jni](jni/) | Ergonomic C bindings to JNI C API and several helper methods |
+| [jni_gen](jni_gen/) | Tool to generate Dart bindings to Java code using FFI |
+
+This is a work-in-progress project under Google Summer of Code 2022 program.
+