added express vaildator package

Author: Hitansh159

package-lock.json

@@ -14,6 +14,7 @@
     "debug": "~2.6.9",
     "dotenv": "^16.0.3",
     "express": "^4.18.2",
+    "express-validator": "^6.15.0",
     "jsonwebtoken": "^9.0.0",
     "mongoose": "^6.9.0",
     "morgan": "~1.9.1"