Publish the demo app to the Play Store

[DaSpood]

To allow developers to more easily try the library without having to clone the repository, the demo app should be made available on the Google Play Store (other less-popular android stores will be ignored).

The demo app should be reworked to make it clear what its purpose is, how to use it, and have the ability to redirect the user to the github repository. It should also come bundled with all available OSS SDKs, and the modern AndroidX activities.

It is worth considering extracting the demo app to its own repository, while only keeping a "test" activity in the main repo for testing purposes.