Add basic code view and sourceMapping

src/index.tsx

@@ -3,6 +3,7 @@ import ReactDOM from 'react-dom';
 import './index.css';
 import App from './App';
 import * as serviceWorker from './serviceWorker';
+import { sourceMapping } from './sourceMapping';
 
 ReactDOM.render(
   <React.StrictMode>
@@ -11,6 +12,8 @@ ReactDOM.render(
   document.getElementById('root')
 );
 
+console.log(sourceMapping);
+
 // 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