added app download route

src/index.js

@@ -1,5 +1,7 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
+import { BrowserRouter as Router } from 'react-router-dom';
+
 import App from './App';
 import './assets/css/bootstrap.min.css';
 import './assets/css/custom-animated.css';
@@ -12,7 +14,9 @@ import './assets/css/style.css';
 
 ReactDOM.render(
     <React.StrictMode>
-        <App />
+        <Router>
+            <App />
+        </Router>
     </React.StrictMode>,
     document.getElementById('root')
 );