Adding Test Library Dependencies to app.json

[christianbraeunlich]

Currently I'm cloning a template project which has all the available test library dependencies already in place, which is a bad practice I would say and to get away from that approach I'd like to insert them via the help of VS Code.

Most of the time I'm trying to figure out the actual id of that dependency.

I think a command which opens a dropdown menue to choose the available test libraries from would be a good starting point.

See https://www.fluxxus.nl/index.php/bc/test-apps-dependencies/ for a a possible list of test library dependencies.