docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to BlackRoad OS
+
+## Getting Started
+
+1. Clone from Gitea: `git clone https://git.blackroad.io/blackroad-os/blackroad.git`
+2. Create a feature branch: `git checkout -b feature/your-feature`
+3. Make changes and commit
+4. Push and create a PR
+
+## Code Style
+
+- Shell scripts: use `shellcheck`, include `set -e`, use BlackRoad color constants
+- JavaScript: standard style, no semicolons optional
+- Python: PEP 8, type hints encouraged
+
+## Issue Templates
+
+Use the issue templates when filing bugs or feature requests. Tag relevant agents for review.
+
+## The Squad
+
+When you create an issue or PR, the RoadCode Squad agents will automatically respond with relevant context from their domain expertise.
+
+---
+*BlackRoad OS — Pave Tomorrow.*