Update index.html

en/index.html

@@ -4251,6 +4251,13 @@ <h4 class="text-gray"><i class="linecons-tag" style="margin-right: 7px;" id="UED
     <script src="../assets/js/xenon-toggles.js"></script>
     <!-- JavaScripts initializations and stuff -->
     <script src="../assets/js/xenon-custom.js"></script>
+    <script>
+  ((window.gitter = {}).chat = {}).options = {
+
+    room: 'GeekS356/WebStack'
+  };
+</script>
+<script src="https://cdn.bootcss.com/gitter-sidecar/1.3.3/sidecar.js" async defer></script>
 </body>
 
 </html>