IUserRepository userRepository = new UserRepository(); User user = new User { FirstName = "John", LastName = "Doe", Email = "[email protected]", PasswordHash = "hashedpassword" }; userRepository.Add(user);In this example, we create a new instance of UserRepository and use the Add method to add a new user to the repository. The User class represents a user entity with properties such as FirstName, LastName, Email, and PasswordHash. The package library for IUserRepository and UserRepository classes is usually application-specific and is not a part of any external library.