Update index.html

Author: remoolB

index.html

@@ -48,6 +48,9 @@ <h2>项目展示</h2>
             <div class="project-card">
                 <p><a href="weather.html" target="_blank"><h3>天气预报</h3></a></p>
             </div>
+            <div class="project-card">
+                <p><a href="http://localhost:3000" target="_blank"><h3>留言板</h3></a></p>
+            </div>
         </div>
     </section>