Import/Sync with Kitsu (Hummingbird)
This should be straight forward, they have a pretty decent API: https://github.com/hummingbird-me/hummingbird/wiki/API-Reference.
Now extremely awesome would be not just import, but a sync feature (this is possible with the API). I realize you might not be interested in supporting this but I would love you for it :)
You can import Kitsu to Simkl from https://simkl.com/apps/import/kitsu/
Guess we should change this to Kitsu since Hummingbird is scrapped...
Here's the documentation: http://docs.kitsu17.apiary.io