Flutter OpenGL test 1.0

This is an early stage of a plugin for Flutter to let the developers use an OpenGL widget. This is not a binding to let the devs to write OpenGL code within Flutter, but shader and drawing frame functions are implemented into C/C++ code.
The plugin is only available for Android OS, looking forward for someone to make it cross-platform!

Source code available here https://github.com/alnitak/flutter_opengl