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This section of the admin was created by the Example Addon. If you install and enable that addon, the admin menu items will display.
This category is actually created automatically when you "add" an admin page (see admin.php the function init_pages).
Any pages you add using geoAdmin::addAddonPage() will be placed in this category. If you specify a "parent" for the admin page, the page will also appear in the admin menu wherever you specify.
For more information, see the "PHP docs" contained in the files for the example addon. To get started, take a look at our Developers section in this user manual.