docs: add README

README.md

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+# RoadMarket
+
+Digital marketplace for BlackRoad services, integrations, and extensions.
+
+Part of [BlackRoad OS](https://blackroad.io) — your device, your data, your AI.
+
+## What This Does
+
+A storefront where users can discover, install, and manage BlackRoad extensions, agent skills, and service integrations.
+
+## Quick Start
+
+```bash
+open index.html
+# Marketplace at market.blackroad.io
+```
+
+## Tech Stack
+
+- HTML/CSS/JS
+- Marketplace UI
+- Extension management
+- Service catalog
+
+## Related
+
+- [BlackRoad OS](https://blackroad.io)
+- [Documentation](https://docs.blackroad.io)
+
+---
+
+BlackRoad OS — Pave Tomorrow.