Add contributing guidelines

Author: blackboxprogramming

CONTRIBUTING.md

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+# Contributing to BlackRoad OS
+
+Thank you for your interest in BlackRoad OS.
+
+## Proprietary Software
+
+This repository is **proprietary software** owned by BlackRoad OS, Inc. External contributions are not currently accepted.
+
+## Internal Contributors
+
+If you are a BlackRoad team member or authorized contributor:
+
+1. Create a feature branch from `main`
+2. Make your changes
+3. Open a pull request for review
+4. All PRs require approval from @blackboxprogramming
+
+## Code Standards
+
+- Follow existing code style and conventions
+- Include tests where applicable
+- Keep commits atomic and well-described
+
+## Contact
+
+- **CEO:** Alexa Louise Amundson
+- **Email:** alexa@blackroad.io
+- **GitHub:** [@blackboxprogramming](https://github.com/blackboxprogramming)
+
+---
+
+Copyright (c) 2024-2026 BlackRoad OS, Inc. All rights reserved.