As a user, I would like to rate my favorite games.

The application could have a rating system to show how good the games are. Maybe it could be a 5-star rating system or a rating out of 10.

The issue does not name any files, tests, or entry points. Start by reviewing the application structure and existing game and user flows, then determine whether the rating should use five stars or a score out of ten. Done means an agreed rating system is implemented and its behavior is covered by appropriate checks.

Written by the indexing model from the issue text.