Android version

Hi Marcel,

I finally managed to finish the Android version of the module. It wraps the [CircularSeekBar](https://github.com/manumaticx/AndroidCircularSeekBar) but I have used the same API for the proxy as the original iOS module. The original Readme was moved into the `ios `folder, just in case you are looking for it ;)

Liebe Grüße,
Manuel