docs: add README

README.md

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+# BlackRoad Watch
+
+Apple Watch companion app for monitoring BlackRoad fleet status on the go.
+
+Part of [BlackRoad OS](https://blackroad.io) — your device, your data, your AI.
+
+## What This Does
+
+Glanceable fleet health, agent status, and alerts right on your wrist. Connects to the BlackRoad status API.
+
+## Quick Start
+
+```bash
+make build
+make install
+# Requires Xcode and Apple Watch
+```
+
+## Tech Stack
+
+- Swift/SwiftUI
+- watchOS
+- Makefile build
+- Fleet status API
+
+## Related
+
+- [BlackRoad OS](https://blackroad.io)
+- [Documentation](https://docs.blackroad.io)
+
+---
+
+BlackRoad OS — Pave Tomorrow.