docs: add README

README.md

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+# BlackRoad OS Infra
+
+Infrastructure documentation and configuration files for the BlackRoad OS fleet.
+
+Part of [BlackRoad OS](https://blackroad.io) — your device, your data, your AI.
+
+## What This Does
+
+Central reference for all infrastructure configs — network topology, service ports, SSH keys, WireGuard configs, and deployment targets.
+
+## Quick Start
+
+```bash
+# Reference documentation
+cat INFRASTRUCTURE.md
+```
+
+## Tech Stack
+
+- Infrastructure-as-documentation
+- Network configs
+- Fleet topology
+- Port mappings
+
+## Related
+
+- [BlackRoad OS](https://blackroad.io)
+- [Documentation](https://docs.blackroad.io)
+
+---
+
+BlackRoad OS — Pave Tomorrow.