For Future Publication: Add function to add client_secret and client_id

[Boosteblume]

If we publish this extension, a new user needs to first enter his client_id and client_secret. These values need to be stored in the env file.

This would also need a explanation of the whole app

[marcjulianschwarz]

and we have to check what data is made available by the API. Depending on how the settings were chosen we might have to limit the commands functionalities.