Sample React-Express-MongoDB (#59)

Signed-off-by: Afzal <sah.afzal@gmail.com>

react-express-mongodb/frontend/src/index.js

@@ -0,0 +1,14 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import App from './App';
+import * as serviceWorker from './serviceWorker';
+
+import './custom.scss';
+
+ReactDOM.render(<App />, document.getElementById('root'));
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: https://bit.ly/CRA-PWA
+serviceWorker.unregister();