Merge pull request #95 from CS3219-AY2425S1/feat/live_collaboration

Add live collaboration between users

Author: tyouwei

.gitignore

@@ -35,6 +35,7 @@ yarn-error.log*
 # local env files
 .env*.local
 */.env
+&/.env.dev
 
 # vercel
 .vercel

api-gateway/package.json

@@ -21,6 +21,7 @@
     "express": "^4.21.1",
     "http-proxy-middleware": "^3.0.3",
     "jsonwebtoken": "^9.0.2",
+    "socket.io": "^4.8.1",
     "winston": "^3.15.0",
     "ws": "^8.13.0"
   },