add artplayer-plugin-vtt-thumbnail

docs/index.html

@@ -47,6 +47,10 @@
                                     <a
                                         href="/?libs=https://cdnjs.cloudflare.com/ajax/libs/hls.js/8.0.0-beta.3/hls.min.js%0A./uncompiled/artplayer-plugin-hls-quality/index.js&example=hls.quality">artplayer-plugin-hls-quality</a>
                                 </li>
+                                <li>
+                                    <a
+                                        href="/?libs=./uncompiled/artplayer-plugin-vtt-thumbnail/index.js&example=vtt.thumbnail">artplayer-plugin-vtt-thumbnail</a>
+                                </li>
                             </ul>
                             <ul>
                                 <li class="title">Tools</li>