Installed the required libraries

comments-service/package.json

@@ -3,10 +3,18 @@
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
+  "type": "module",
   "scripts": {
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "start": "node index.js"
   },
   "keywords": [],
   "author": "",
-  "license": "ISC"
+  "license": "ISC",
+  "dependencies": {
+    "body-parser": "^1.19.0",
+    "cors": "^2.8.5",
+    "dotenv": "^8.2.0",
+    "express": "^4.17.1",
+    "mongoose": "^5.12.3"
+  }
 }