✨ Set up Copilot instructions

[leecalcote]

Configure instructions for this repository as documented in Best practices for Copilot coding agent in your repository.

---

Contributor Guide and Resources

• 📚 Instructions for contributing to documentation
  • Layer5 documentation site and source
• 🎨 Wireframes and designs for Layer5 site in Figma (open invite)
• 🙋🏾🙋🏼 Questions: Layer5 Discussion Forum and Layer5 Community Slack