Update index.html

Author: CB-X2-Jun

index.html

@@ -87,6 +87,13 @@ <h2>页面合法输入示例</h2>
             https://github.com/microsoft/vscode/archive/refs/tags/1.82.3.zip
           </a>
         </li>
+        <li>
+          <span class="label">分支文件：</span>
+          <a href="https://github.com/zhblue/freeproblemset/blob/master/fps-examples/PerformanceTest.xml" class="example-link">
+            https://github.com/zhblue/freeproblemset/blob/master/fps-examples/PerformanceTest.xml
+          </a>
+          <p>（部分节点不支持，若出现问题请更换节点）</p>
+        </li>
       </ul>
     </div>
   </div>