Create accessibility demo page for menu

[tinayuangao]

[amcdnl]

@tinayuangao - I added demos for the following:

• Click on the icon will trigger menu
• Display menu options with icon

Can you provide more explanation on what you had in mind for these 2 demos:

• Nested menu
• Navigation menu

[tinayuangao]

@amcdnl
Nested menus are menus with hierarchy, for example

  Tasks
    -- My tasks
    -- Team tasks
    -- Draft

Navigation menu is the menu when you click on it, the page will navigate to another page.

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