Replace bluetooth diagram PNG image with vector XML file.
I decided to not use several raster graphics, but use an XML file instead, so the android gradle plugin creates the raster files itself at build-time. I hope that this resolves the problem you saw on that device of yours.
See merge request !30
and indicate which transports are currently available.
The icons have been chosen from the official material icons and might be
replaced later with icons that better represent the given transport.
Please note that I used vector drawables which will be automatically
converted at build time to raster graphics.
Closes#96
Users were confused by the process of adding a contact for the first time.
This change adds additional explanation and a picture of what is going on.
It also moves part of the UI into XML files.
Closes#87
