[Minor] Add AOSP Build Files

[gudenau]

I added this project's source to my AOSP build and it does not appear to have the required metadata to build with Android itself, from what I can tell it requires an Android.mk.

[Lanchon]

so add it! :) it belongs in your directory, not in this repo (unless you can show me why).

[gudenau]

In order to be built in a ROM there needs to be a way for the build system to know about the application. There is a little metadata that is put into a Makefile that is checked when building to figure out where everything is and how it is built. This Makefile is part of the source of the application.

[Lanchon]

This Makefile is part of the source of the application.

no it isn't. this app -as all common android apps- uses the gradle build system, and its repo includes all necessary gradle build scripts. an android-style makefile does not belong in this repo, just like an ant build script or a bazel build file or a GNU makefile don't: because i've chosen gradle.

integration with other build systems (including android's) is your responsibility.

even if you contributed such a makefile i wouldn't merge it, because i won't have stuff in the repo that i don't regularly test.