/// <summary>
 /// Instantiate with default configuration
 /// </summary>
 public PasswordHasher()
 {
     _configuration = new PasswordHashingConfiguration();
 }
 /// <summary>
 /// Instantiate with custom configuration
 /// </summary>
 /// <param name="configuration"></param>
 public PasswordHasher(PasswordHashingConfiguration configuration)
 {
     _configuration = configuration;
 }