feat: add employer authentication method and view model to registration workflow

ServiceHost/Areas/Admin/Controllers/RegistrationWorkflowController.cs

@@ -58,5 +58,18 @@ namespace ServiceHost.Areas.Admin.Controllers
             var result = await _workshopApplication.CreateWorkshopWorkflowRegistration(command);
             return result;
         }
+        [HttpPost("auth-employer")]
+        public async Task<ActionResult<OperationResult<AuthenticateUserViewModel>>> AuthenticateEmployer(AuthenticateEmployerWorkflowRequest command)
+        {
+            var result = await _employerApplication.AuthenticateEmployer(command.NationalCode, command.DateOfBirth, command.Mobile);
+            return result;
+        }
+    }
+
+    public class AuthenticateEmployerWorkflowRequest
+    {
+        public string NationalCode { get; set; }
+        public string DateOfBirth { get; set; }
+        public string Mobile { get; set; }
     }
 }