create (FileMenu)

         # File lib/json/editor.rb, line 527
    527:       def create
    528:         title = MenuItem.new('File')
    529:         title.submenu = menu
    530:         add_item('New', &method(:new))
    531:         add_item('Open', ?o, &method(:open))
    532:         add_item('Open location', ?l, &method(:open_location))
    533:         add_item('Revert', &method(:revert))
    534:         add_separator
    535:         add_item('Save', ?s, &method(:save))
    536:         add_item('Save As', ?S, &method(:save_as))
    537:         add_separator
    538:         add_item('Quit', ?q, &method(:quit))
    539:         title
    540:       end