Add ringtone

src/index.html

@@ -57,6 +57,7 @@
         <img id="send" src="./images/send.png">
         <img id="close" src="./images/cross.png">
     </div>
+    <audio id="ringtone" src="./ringtone.mp3"></audio>
     <script src="https://danby.aniere.fr:3000/socket.io/socket.io.js"></script>
     <script src="https://unpkg.com/swiper@8/swiper-bundle.min.js"></script>
     <script src="script.js"></script>