feat: added create user function in the user service

package.json

@@ -24,7 +24,11 @@
     "@nestjs/config": "^4.0.4",
     "@nestjs/core": "^11.0.1",
     "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/swagger": "^11.4.6",
     "@nestjs/typeorm": "^11.0.3",
+    "bcrypt": "^6.0.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.15.1",
     "joi": "^18.2.3",
     "pg": "^8.22.0",
     "reflect-metadata": "^0.2.2",
@@ -37,6 +41,7 @@
     "@nestjs/cli": "^11.0.0",
     "@nestjs/schematics": "^11.0.0",
     "@nestjs/testing": "^11.0.1",
+    "@types/bcrypt": "^6.0.0",
     "@types/express": "^5.0.0",
     "@types/jest": "^30.0.0",
     "@types/node": "^22.10.7",