Add README

README.md

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+# Jitsi Excalidraw backend
+
+Simple [Excalidraw] collaboration backend based on [excalidraw-room].
+
+## Building
+
+```bash
+npm install
+npm run build
+```
+
+## Development
+
+```bash
+npm run start:dev
+```
+
+## Production
+
+```bash
+npm start
+```
+
+[Excalidraw]: https://excalidraw.com
+[excalidraw-room]: https://github.com/excalidraw/excalidraw-room