commands/documentation/badges/specifics/prompt-library.md

Add a "Prompt Library" badge to the repository README indicating this repo contains a collection of reusable prompts for AI systems.

Use this shields.io badge format:
```markdown
![Prompt Library](https://img.shields.io/badge/Prompt_Library-8A2BE2?style=for-the-badge)
```

Add it to the appropriate badges section in the README.