Add project: mkdocs-required-frontmatter-plugin

[james-geiger]

What kind of change does this PR introduce?

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

Description:

This PR adds the project mkdocs-required-frontmatter-plugin. This plugin adds a hook on generation that enforces required YAML front matter for all documentation. This can be helpful to enforce consistency across project maintainers or when build processes (particularly those outside MkDocs) further process documentation.

Checklist:

• I have read the CONTRIBUTING guidelines.
• 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]

Thanks! There's just an issue with the blank line: you seem to have removed it. Please maintain blank lines between catégories :)

[pawamoy]

Perfect, thanks!

[james-geiger]

Thanks, @pawamoy!