Moved index.css into css folder for consistency's sake.

src/index.js

@@ -1,7 +1,7 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
-import App from './App';
+import './css/index.css';
+import App from './App.js';
 import registerServiceWorker from './registerServiceWorker';
 
 ReactDOM.render(<App/>, document.getElementById('root'));