Add icon-big to thoma

[ChrisMGeo]

https://api.genshin.dev/characters/thoma/list doesn't show icon-big and https://api.genshin.dev/characters/thoma/icon-big doesn't exist.

[GerGerApex1]

It's missing some images that's why :(. You can make a pull request to add it.

[ChrisMGeo]

Um, I'm pretty new to how any of these projects and apis work, but I was also using the https://github.com/frzyc/genshin-optimizer project as a reference for my use case, and they have a bunch of character assets, but I'm not sure if you're able to use their assets, but this link is for the thoma icon https://github.com/frzyc/genshin-optimizer/blob/master/src/Data/Characters/Thoma/Icon.png I think this is the big icon too.