Add code specification descriptions and code run detection tools

[MercuryDemo]

During the process of submitting a pull request to solve issue 332, I found that pong_game.py has many basic logical errors that make it almost impossible to run properly, and the code lacks basic explanations of game rules.
So, I suggest requiring all submitted code to add a specification description in the form of comments at the beginning of the code, explaining the purpose, standard usage, examples, etc. of the code AND adding a detection tool to check the code's standardization and whether it can run normally.