Add Ads to the application

[MathisBurger]

Because it costs a lot of effort to develop, maintain and host the application, we should think about adding advertising to the application in some way, to cover at least the server costs al little.
There should also be the option to disable the ads anytime we want.
Furthermore, we should implement the ads in a way, that they are not anoying the user or affecting the platform usage

[MathisBurger]

Would require an update of our privacy policy

[MathisBurger]

Will be moved to test release, because it would only be fair to only add advertising if the application is 100% properly tested.