UX: Add steps/intro/basic info to the start screen
A new user may download the app, wondering what quasseldroid is.
The app starts on this empty screen and for example there is no way to know what that empty thing at the top is.
A user may have the following questions:
- What do I connect to?
- What do I need for a quassel installation?
- Can I use someone else's Quassel-Core?