update,

_resources/it114105/itp4506/Assignment/20-21/src/index.js

@@ -0,0 +1,17 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import './index.css';
+import Router from './AppRouter';
+import * as serviceWorker from './serviceWorker';
+
+ReactDOM.render(
+  <React.StrictMode>
+    <Router />
+  </React.StrictMode>,
+  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();