Add comments on every function definition with arguments and return value descriptions

[raj454raj]

[monsij]

Interested! @raj454raj

[raj454raj]

Hey @monsij ! Feel free to raise a PR to the repo following a similar structure like https://github.com/stopstalk/stopstalk-deployment/blob/2e3f8c7334e82577b3f4efd23ca9d95f4e194f4a/modules/sites/codeforces.py#L64