Last steps:

Initial solution to display the star rating is based on a w3schools.com How To:

One of my clients needs a star rating system for his product reviews. There is an old module for that: FiveStar. And that's fine because he's still running Drupal 7. But he has expressed ambitions to migrate to Drupal 8 and the latest version of FiveStar for Drupal 8 is still in alpha.