repo initialized

src/App.js

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+import './App.css';
+
+function App() {
+  return (
+    <div>
+      Hello World!
+    </div>
+  );
+}
+
+export default App;

src/index.js

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+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+  document.getElementById('root')
+);