def page_setup
      @page_setup ||= PageSetup.new
      yield @page_setup if block_given?
      @page_setup
    end
Page setup settings for printing the worksheet.
@example
wb = Axlsx::Package.new.workbook

# using options when creating the worksheet.
ws = wb.add_worksheet :page_setup => {:fit_to_width => 2, :orientation => :landscape}

# use the set method of the page_setup object
ws.page_setup.set(:paper_width => "297mm", :paper_height => "210mm")

# setup page in a block
ws.page_setup do |page|
page.scale = 80
page.orientation = :portrait
end
@see PageSetup#initialize
@return [PageSetup]