Create auto checker

[tshemsedinov]

Here are hints to detect automatically https://github.com/HowProgrammingWorks/Exams/blob/master/HINTS.md

[nau7ilus]

What should it look like? I think we can use Eslint rules so that they will completely follow Hints.md. And the checks would be called on the creation of the PR. And not only eslint, but also unit tests. We can use Github Actions here.
And there are several options here, too. Let's say, at PR creation, if the bot is added to reviewers, it will run the tasks and send a feedback message about broken rules and testing errors. Or to make it simpler: just run checks on commit, without sending messages to PR