* Added Authentication

OrdersManagementDataModel/Services/IUserService.cs

@@ -9,6 +9,7 @@ public interface IUserService
     Task<UserDto?> GetByUsername(string username);
     Task<int> Add(UserDto userDto);
     Task<int> Update(UserDto userDto);
+    Task<int> Login(UserDto userDto);
     Task<int> Delete(Guid id);
     Task<IList<UserRoleDto>> GetUserRoles(Guid userId);
     Task<UserDto?> GetUserByLoginAndPassword(string login, string password);