added comment on server code

Author: Sakif Surur

package-lock.json

@@ -1,35 +1,44 @@
 const express       = require("express")
 const http          = require("http")
 const WebSocket     = require("ws")
+
+// Broadcaster is a class that emit event when a new datapoint arrive
+// This is just an emulation of real life situation where datapoint came in randomly
 const Broadcaster   = require ("./Broadcaster")
 
 const app        = express()
 
+// Create own HTTP server instead of using app.listen() in order to share the same port with WS
 const httpServer = http.createServer(app)
 
+// Initating all middleware for express
 app
 	.set("views", `${process.cwd()}/src/server/views`)
 	.set("view engine", "pug")
 	.use(express.static(`${process.cwd()}/src/client`))
 
+// Render index.pug from views for root URL
 app
 	.get("/", (req, res) => {
 		res.render("index")
 	})
 
-
+// Initiate websocket server with the same server as express
 const wss = new WebSocket.Server({ server: httpServer })
 
+// Create new Broadcaster
+// Maybe you can add multiple broadcaster for multiple bus using the same data to make it a little interesting
 const broadcaster = new Broadcaster()
 
 broadcaster.start()
 broadcaster.on("data", (data) => {
+	// Send data to all connected clients on websocket
 	wss.clients.forEach((socket) => {
 		socket.send(JSON.stringify(data))
 	})
 })
 
-
+// Start listening on port 3000 for both express app and WS server
 httpServer.listen(3000, () => {
 	console.log("HTTP server listening on port 3000")
 })