docs: add README

README.md

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+# BlackRoad LangChain Studio
+
+Visual LangChain pipeline builder and testing environment.
+
+Part of [BlackRoad OS](https://blackroad.io) — your device, your data, your AI.
+
+## What This Does
+
+Build, test, and debug LangChain pipelines with a visual interface. Connect to local Ollama models running on the Pi fleet.
+
+## Quick Start
+
+```bash
+open index.html
+# Connect to Ollama at http://192.168.4.96:11434
+```
+
+## Tech Stack
+
+- HTML/CSS/JS
+- LangChain.js
+- Ollama integration
+- Visual pipeline editor
+
+## Related
+
+- [BlackRoad OS](https://blackroad.io)
+- [Documentation](https://docs.blackroad.io)
+
+---
+
+BlackRoad OS — Pave Tomorrow.