Update public/index.html

public/index.html

@@ -10,6 +10,7 @@
 
 <div id="music-player">
     <input type="text" id="search-bar" placeholder="Search Music...">
+    <button id="loop-toggle" onclick="toggleLoop()">Loop: Off</button>
     <div id="music-list"></div>
     <audio id="audio-player" controls></audio>
 </div>