installing socketIO and testing the WebSocket connection

app/assets/javascripts/socket.js

@@ -0,0 +1,23 @@
+
+(function (window) {
+    document.addEventListener('DOMContentLoaded', (event) => {
+        var socket = io();
+
+        socket.on('connect', function() {
+            console.log('Connected to the server');
+        });
+
+        socket.on('message', function(msg) {
+            var li = document.createElement("li");
+            li.appendChild(document.createTextNode(msg));
+            document.getElementById("messages").appendChild(li);
+        });
+
+        document.getElementById('sendButton').addEventListener('click', function() {
+            var message = document.getElementById("message").value;
+            socket.send(message);
+            document.getElementById("message").value = '';
+        });
+    });
+
+})(window);