Create backend

- NodeJs
 - Express
 - Socket.io
 - Eslint
 - TypeScript

back/src/App.ts

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+// lib/app.ts
+import {IoSocketController} from "./Controller/IoSocketController";
+import express from "express";
+import {Application} from 'express';
+import bodyParser = require('body-parser');
+import * as http from "http";
+
+class App {
+    public app: Application;
+    public server: http.Server;
+    public ioSocketController: IoSocketController;
+
+    constructor() {
+        this.app = express();
+        this.config();
+        this.server = http.createServer(this.app);
+        this.ioSocketController = new IoSocketController(this.server);
+    }
+
+    private config(): void {
+        this.app.use(bodyParser.json());
+        this.app.use(bodyParser.urlencoded({extended: false}));
+    }
+}
+
+export default new App().server;

back/src/Controller/IoSocketController.ts

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+import socketIO = require('socket.io');
+import {Socket} from "socket.io";
+import * as http from "http";
+import {JoinRoomMessage} from "@Model/Websocket/JoinRoomMessage";
+
+export class IoSocketController{
+    Io: socketIO.Server;
+    constructor(server : http.Server) {
+        this.Io = socketIO(server);
+        this.ioConnection();
+    }
+
+    ioConnection() {
+        this.Io.on('connection',  (socket: Socket) => {
+            //TODO check token access
+
+            /*join-rom event permit to join one room.
+                message :
+                    userId : user identification
+                    roomId: room identification
+                    positionXUser: user x position map
+                    positionYUser: user y position on map
+            */
+            socket.on('join-room', (message : JoinRoomMessage) => {
+                socket.join(message.roomId);
+                socket.to(message.roomId).emit('join-room', message.toString());
+            });
+        });
+    }
+}

back/src/Model/Websocket/JoinRoomMessage.ts

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+export class JoinRoomMessage {
+    userId: string;
+    roomId: string;
+    positionXUser: string;
+    positionYUser: string;
+
+    constructor(message: string) {
+        let data = JSON.parse(message);
+        this.userId = data.userId;
+        this.roomId = data.roomId;
+        this.positionXUser = data.positionXUser;
+        this.positionYUser = data.positionYUser;
+    }
+
+    toString(){
+        return JSON.stringify({
+            userId: this.userId,
+            roomId: this.roomId,
+            positionXUser: this.positionXUser,
+            positionYUser: this.positionYUser
+        })
+    }
+}