commands/documentation/badges/specifics/markdown-files.md

Add a "Markdown Files" badge to the repository README indicating this repo primarily contains markdown documentation or content.

Use this shields.io badge format:
```markdown
![Markdown Files](https://img.shields.io/badge/Markdown_Files-000000?style=for-the-badge&logo=markdown&logoColor=white)
```

Add it to the appropriate badges section in the README.