Publish Trevor on F-Droid

[SecUpwN]

Hey @ekonstantinidis, thanks again for your wonderful app! I'd like to see Trevor on F-Droid.
See how to add it and feel free to add the following F-Droid badge to your README once it got accepted:

• Badge to copy and paste to your README when Trevor finally got added to F-Droid:

[![F-Droid](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Get_it_on_F-Droid.svg/320px-Get_it_on_F-Droid.svg.png)](https://f-droid.org/repository/browse/?fdid=com.iamemmanouil.trevor "Trevor on F-Droid")