Setup web-socket connection

- Add authentification socket.io with jwt token

back/package.json

@@ -21,9 +21,11 @@
   "homepage": "https://github.com/thecodingmachine/workadventure#readme",
   "dependencies": {
     "@types/express": "^4.17.4",
+    "@types/jsonwebtoken": "^8.3.8",
     "@types/socket.io": "^2.1.4",
     "body-parser": "^1.19.0",
     "express": "^4.17.1",
+    "jsonwebtoken": "^8.5.1",
     "socket.io": "^2.3.0",
     "ts-node-dev": "^1.0.0-pre.44",
     "typescript": "^3.8.3"