Tests, Links and Android

Minor changes to the Credits as well as Links (click a name to open it). I had removed them because of Google Play Store but itch is not bound by their rules.

Brought the Android  release back as well. As you might have guessed, this is the target platform.

Also took some snazy gifs showing the App working.

Keen players might notice the "Review" button next to "Credits". It shows the numbers in your last attempt. The best way to make sure you're not being fooled. Do remember that the PEMDAS order of operations is used though.