Create CONTRIBUTING.md

CONTRIBUTING.md

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+## Repo Structure
+```
+├─firmware/ - Embedded code for the core system
+├─hardware/ - Schematics and PCB layouts
+├─software/ - Host tools (keymap editor, etc.) (not yet implemented - soon hopefully!)
+├─docs/ - Design notes, communication protocol, build guides
+└─assets/ - Renders, diagrams, and media
+```
+
+## Branch Structure
+```
+main              # Stable, production-ready code (only tested & reviewed changes go here)
+│
+├─ dev            # Integration branch for features; "staging" area before merging to main
+│  ├─ software-xxxxxx     # New features, experiments, improvements, or PCB uploads    
+|  ├─ firmware-xxxxxx     # Please indicate in the branch the wether if its software
+│  └─ hardware-xxxxxx     # firmware, or hardware
+│
+├─ hotfix/        # Quick fixes for urgent bugs in main
+│   └─ hotfix/usb-detection
+│
+└─ docs/          # Documentation updates
+    └─ docs/protocol-update
+```