Update index.html

Author: MaxYT5184

index.html

@@ -62,5 +62,8 @@ <h1>Welcome to Our School SMP!</h1>
   </script>
 
   <script defer src="auth.js"></script>
+
+  <!-- Add install button -->
+  <button id="install-button" style="display:none;">Install App</button>
 </body>
 </html>