Update README.md

Author: cheton

README.md

@@ -5,3 +5,34 @@ A higher order React component for [Sortable](https://github.com/RubaXa/Sortable
 ```bash
 npm install --save react-sortablejs
 ```
+
+## Usage
+
+```js
+import SortableMixin from 'react-sortablejs';
+
+const sortableOptions = {
+    ref: 'list',
+    model: 'items'
+};
+
+class MySortableComponent extends React.Component {
+    state = {
+        items: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+    };
+    
+    render() {
+        const items = this.state.items.map((text, index) => (
+            <li key={index}>{text}</li>
+        ));
+        
+        return (
+            <div>
+                <ul ref="list">{items}</ul>
+            </div>
+        );
+    }
+}
+
+export default SortableMixin(MySortableComponent, sortableOptions);
+```