Add comment to root creation in index.tsx

Added a comment to the root creation line for testing purposes.

Author: Haarolean

frontend/src/index.tsx

@@ -8,7 +8,7 @@ import 'theme/index.scss';
 
 const container =
   document.getElementById('root') || document.createElement('div');
-const root = createRoot(container);
+const root = createRoot(container); // test
 
 root.render(
   <BrowserRouter basename={window.basePath || '/'}>