📝 docs: add GITMOJI_CHEATSHEET.md and reference in README

- Created comprehensive Gitmoji cheatsheet in documentation/
- Added quick reference to README for common Gitmoji
- Links to full cheatsheet for all Gitmoji options
- Helps team use consistent commit message format

This provides:
- Quick visual reference for common Gitmoji
- Examples of good/bad commit messages
- Best practices for commit formatting
- Easy access to full reference when needed

No more guessing which Gitmoji to use!

Refs: #documentation, #gitmoji, #conventions

README.md

@@ -346,6 +346,17 @@ For complete agent usage guide including:
 
 See: [AGENT_USAGE_GUIDE.md](documentation/AGENT_USAGE_GUIDE.md)
 
+### Gitmoji Cheatsheet
+
+Quick reference for commit messages:
+- **📝 `:memo:` docs** - Documentation
+- **✨ `:sparkles:` feat** - New feature
+- **🐛 `:bug:` fix** - Bug fix
+- **♻️ `:recycle:` refactor** - Code refactoring
+- **🔧 `:wrench:` chore** - Build/config changes
+
+Full cheatsheet: [GITMOJI_CHEATSHEET.md](documentation/GITMOJI_CHEATSHEET.md)
+
 ## License
 
 MIT