Update README.md

Author: Reza-0

README.md

@@ -141,6 +141,14 @@ function initializeExpressContextProvider(req, res) {
                 }
             };
         },
+        getEnqueueTokenProvider: function(){
+            return {
+                getEnqueueToken: function(waitingRoomId){
+                    // If you need to use an enqueue token when enqueuing, you need to return it here.
+                    return null;
+                }
+            };
+        },
         getHttpRequest: function () {
             var httpRequest = {
                 getUserAgent: function () {