Add SIMKL Support

Hello, Could you add support for SIMKL.com ? Its a tracking site for Movies, TV Shows, Anime. 

They do have an API here: https://api.simkl.com/  (SIMKL has various ID's connected like AniDB, MAL, Anilist, Kitsu, IMDB, TMDB, TVDB, etc)

The developer team is also very active and friendly on their Discord server here: https://discord.gg/u89XfYn 

