public XintroActivityBuilder addFragments(IntroFragmentModel... introFragmentAttributes){
  for (  IntroFragmentModel introFragmentAttribute : introFragmentAttributes) {
    introFragmentModelList.add(introFragmentAttribute);
  }
  return this;
}

public XintroActivityBuilder addFragments ( IntroFragmentModel ... introFragmentAttributes ) { for ( IntroFragmentModel introFragmentAttribute : introFragmentAttributes ) { introFragmentModelList . add ( introFragmentAttribute ) ; } return this ; }
add introfragmentattributes to xintro activity builder .
