Update README.md to provide a comprehensive overview of The Order monorepo, including repository structure, quickstart guide, development workflow, and contribution guidelines.

packages/ui/README.md

@@ -0,0 +1,28 @@
+# @the-order/ui
+
+Design system and UI components for The Order.
+
+## Usage
+
+```tsx
+import { Button } from '@the-order/ui';
+
+function MyComponent() {
+  return <Button variant="primary">Click me</Button>;
+}
+```
+
+## Components
+
+- `Button` - Button component with variants
+
+## Development
+
+```bash
+# Build
+pnpm build
+
+# Watch mode
+pnpm dev
+```
+