use dotenv and add test package

Express/barAndCafe/package.json

@@ -8,11 +8,17 @@
   "dependencies": {
     "@types/express": "^4.17.21",
     "@types/node": "^20.12.7",
+    "dotenv": "^16.4.5",
     "express": "^4.19.2",
     "rimraf": "^5.0.5",
     "typescript": "^5.4.5"
   },
   "devDependencies": {
-    "nodemon": "^3.1.0"
+    "babel-cli": "^6.26.0",
+    "babel-preset-env": "^1.7.0",
+    "jest": "^29.7.0",
+    "nodemon": "^3.1.0",
+    "superagent": "^9.0.2",
+    "supertest": "^7.0.0"
   }
 }