➕ Add eslint and prettier

package.json

@@ -27,6 +27,12 @@
   "devDependencies": {
     "@types/express": "^4.17.12",
     "@types/node": "^15.12.2",
-    "@types/ws": "^7.4.4"
+    "@types/ws": "^7.4.4",
+    "@typescript-eslint/eslint-plugin": "^5.9.0",
+    "@typescript-eslint/parser": "^5.9.0",
+    "eslint": "^8.6.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "prettier": "^2.5.1"
   }
 }