Add SIMKL.com Mapping

[Azmarine13]

SIMKL (https://simkl.com/anime/) has various ID's connected like

• AniBrain
• Anime Countdown
• IMDB
• Official Website,
• TMDB
• ANN
• MAL
• ALLCIN
• TVDB
• NETFLIX
• AniList
• Anime-Planet
• aniSearch
• Kitsu
• LiveChart
• AniDB

Maybe this might help you?
Documentation: https://api.simkl.com/