Add Swagger/OpenAPI docs about docs HOT 4 CLOSED

@pjalsGit The spec is now valid after #27 and #28, thank you @jakobkmar!

from docs.

Already exists
https://docs.modrinth.com/api-spec

from docs.

It seems like that isn't a valid OpenAPI specification, as this random validator I found and Hoppscotch fail to validate/load it.

from docs.

I can't figure out how to satisfy these validators. There are several places where it's saying that the required boolean for path parameters is required. So I add required: false, because some path params aren't required, but guess what the validator says? It says that false is not a valid value. I change it to true and it doesn't complain. What do you want from me, validators?!?!?! Are you trying to make everything required??

If you can figure out a way to appease the validators, please open a pull request, but I cannot figure out how to make this be "valid" while still being accurate...

from docs.