add project: mkdocs_quiz

[bdallard]

What kind of change does this PR introduce?

• [X] Add a project
• [ ] Update a project
• [ ] Remove a project
• [ ] Add or update a category
• [ ] Change configuration
• [ ] Documentation
• [ ] Other, please describe:

Description: mkdocs_quiz is a MkDocs plugin that allows you to integrate interactive quizzes into your documentation site using custom JSON files and supports multiple quiz types.

Checklist:

• [X] I have read the CONTRIBUTING guidelines.
• [X] I have not modified the README.md file. Projects are only supposed to be added or updated within the projects.yaml file since the README.md file is automatically generated.

[pawamoy]

CI fails because it just needs a new release on PyPI, but we can already merge :)

[pawamoy]

@bdallard could you publish a new release on PyPI? The entrypoint name mismatch continues to cause our CI to fail here :slightly_smiling_face:

[pawamoy]

@bdallard I'll comment your project for now, let me know when you've published a new release and I'll uncomment it :slightly_smiling_face: