How to package a nim program in an APK file

[planetis]

Since this thread was necrobumped by a bot, I should mention that I maintain a 
[template](https://github.com/planetis-m/raylib-game-template) that sets up a 
build environment and builds APKs for your project without gradle. It uses 
naylib but I imagine it can be adapted to use any other game/framework with 
some effort.