- add menu description

package-lock.json

src/app/index.ts

src/lib/config/design.ts

src/lib/elements/buttons/ButtonElement.ts

src/lib/elements/buttons/ColorButtonElement.ts

src/lib/elements/buttons/IndexedRoundButtonElement.ts

src/lib/elements/buttons/RoundButtonElement.ts

src/lib/elements/colors/ColorElement.ts

src/lib/elements/colors/ColorPaletteElement.ts

src/lib/elements/connections/Line.ts

src/lib/elements/controls/SelectGroupElement.ts

src/lib/elements/fills/FillCollection.ts

src/lib/elements/images/Image.ts

src/lib/elements/legends/LegendCollection.ts

src/lib/elements/legends/LegendColumn.ts

src/lib/elements/legends/LegendRow.ts

src/lib/elements/menu/MenuElement.ts

src/lib/elements/menu/RoundSubMenuElement.ts

src/lib/elements/menu/SubMenuElement.ts

src/lib/elements/navigators/NavigatorElement.ts