Request: Include fitness tracking

[SvenHinz]

I found this: https://github.com/Freeyourgadget/Gadgetbridge/issues/49

It's a nice idea to use wger as self-hostable fitness tracking service to log daily activity data.

[rolandgeider]

I know, I've also commented on the issue :)

I'm not sure how and when I can implement this, as it doesn't really fit into what the application does, at least at the moment! I'll think about it, though.