Add README for React renderer

Author: lukasmoschitz

renderers/react/README.md

@@ -0,0 +1,34 @@
+# @a2ui/react
+
+React implementation of A2UI (Agent-to-User Interface).
+
+> **Note:** This renderer is currently a work in progress.
+
+## Installation
+
+```bash
+npm install @a2ui/react
+```
+
+## Usage
+
+```tsx
+import { A2UIProvider, A2UIRenderer } from '@a2ui/react';
+import '@a2ui/react/styles/structural.css';
+
+function App() {
+  return (
+    <A2UIProvider>
+      <A2UIRenderer surfaceId="main" />
+    </A2UIProvider>
+  );
+}
+```
+
+## Development
+
+```bash
+npm run build    # Build the package
+npm run dev      # Watch mode
+npm test         # Run tests
+```