Document which steps follow after an app is added
I read the section about adding an app. and followed it, see !3567 (merged).
Now, I wonder
- when the app turns up in the app store.
- what else needs to be done or can be done by me.
- how I can include updates.
This, I would like to see written down at the bottom if the CONTRIBUTING.md.
If you answer it here, or have a link, I want to provide the documentation as a PR.