Gradle Edition
The root directory roughly follows the default Android Studio project layout, containing the IDE's project configuration directory, project modules in subdirectories, the Gradle wrapper scripts and project build/settings scripts.
The app/ directory contains the main application module. The com.mycompany.app and plugin.library packages live in here. The most interesting of the build scripts is the build.gradle for this module.
The coronaLib/ directory contains Corona's Android library version 2015.2571 from /Applications/CoronaEnterprise/Corona/android/lib/Corona/ ported to an Android Studio library module. This admittedly makes updating the Corona Enterprise version for the project somewhat of a pain.