@NotNull @ObjectiveCName("addAutoJoinGroupWithToken:") public ConfigurationBuilder addAutoJoinGroup(String groupTokenOrShortName){
  autoJoinGroups.add(groupTokenOrShortName);
  return this;
}

@ NotNull @ ObjectiveCName ( "addAutoJoinGroupWithToken:" ) public ConfigurationBuilder addAutoJoinGroup ( String groupTokenOrShortName ) { autoJoinGroups . add ( groupTokenOrShortName ) ; return this ; }
adding group to auto join of users
