First prototypal release

First functional prototype that serves as proof of concept.

Edit 2020-08-22: After more than a year I tried the tutorial out on android again and this time it magically worked (with some warnings though), so android-4.4-with-tutorial.apk file was added, which for some reason is lighter as well than the previous apk. In any case, I will keep the previous android-4.4.apk just in case.