[Request] Adding more platforms

[Auster-1]

Is your feature request related to a problem? Please describe.
Going through the sites.md file, a few which may be relevant seem to be missing.

Describe the solution you'd like
Adding the platforms to the search / DB.

Describe alternatives you've considered
Indicating in the review when a platform the media is on isn't mentioned by default.

Additional context
Some of the platforms that come to mind:

• GOG, mainly for games and some times for game OSTs
• Epic Games, for games
• Google Play, for movies, series, games and books
• Amazon (both international and Japanese), for ebooks and musics
• Play Asia, for physical games and soundtracks
• Ototoy, for musics
• Crunchyroll, mainly for series and some times for movies

[Auster-1]

Some more platforms that could be interesting to add:

• Encyclopaedia Metallum: The Metal Archives (for musics)
• GameFAQS (for games)
• Zoom Platform (for games)