_examples/websocket/basic: add a nodejs client and provide a README.md on how to run the websocket clients and the server

Former-commit-id: a98a80996d7d95fa947e72c71803407682229fa7

_examples/websocket/basic/nodejs-client/client.js

@@ -0,0 +1,35 @@
+const neffos = require('neffos.js');
+const stdin = process.openStdin();
+
+const wsURL = "ws://localhost:8080/echo";
+
+async function runExample() {
+  try {
+    const conn = await neffos.dial(wsURL, {
+      default: { // "default" namespace.
+        _OnNamespaceConnected: function (nsConn, msg) {
+          console.log("connected to namespace: " + msg.Namespace);
+        },
+        _OnNamespaceDisconnect: function (nsConn, msg) {
+          console.log("disconnected from namespace: " + msg.Namespace);
+        },
+        chat: function (nsConn, msg) { // "chat" event.
+          console.log(msg.Body);
+        }
+      }
+    });
+
+    const nsConn = await conn.connect("default");
+    nsConn.emit("chat", "Hello from Nodejs client side!");
+
+    stdin.addListener("data", function (data) {
+      const text = data.toString().trim();
+      nsConn.emit("chat", text);
+    });
+
+  } catch (err) {
+    console.error(err);
+  }
+}
+
+runExample();