code: public Section addSection(float indentation, Paragraph title, int numberDepth) {
      	if (isAddedCompletely()) {
      		throw new IllegalStateException("This LargeElement has already been added to the Document.");
      	}
          Section section = new Section(title, numberDepth);
          section.setIndentation(indentation);
          add(section);
          return section;
      }
docs: Creates a <CODE>Section</CODE>, adds it to this <CODE>Section</CODE> and returns it.
  
  @param	indentation	the indentation of the new section
  @param	title		the title of the new section
  @param	numberDepth	the numberDepth of the section
  @return  a new Section object