docs: README Modify

README.md

@@ -9,3 +9,26 @@ You can give the user a choice and let them choose a value through scrolling.
 ```shell
 npm i react-hook-scroll
 ```
+
+### Example
+
+```jsx
+import { useState } from "react";
+import { VirtualScroll } from "react-hook-scroll";
+
+function App() {
+  const [selected, setSelected] = useState(null);
+
+  return (
+    <div className="App">
+      <VirtualScroll list={[1, 2, 3, 4, 5]} onItemSelected={setSelected} />
+    </div>
+  );
+}
+```
+
+![스크린샷 2023-12-27 오후 6 32 46](https://github.com/imb96/git-recipe/assets/71740032/4084c2a9-6d57-4631-a478-3b3cfc43d436)
+
+List, onItemSelected is required props.
+The 'list' is to hand over the array of lists that you want the user to choose.
+In 'onItemSelected', you can add a function when the user selects an item.