Pagination: describe demo (#28468)

apps/demos/Demos/Pagination/Overview/description.md

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+DevExpress Pagination UI component allows users to navigate between pages and adjust page size at runtime. The Pagination component in this demo allows users to browse employee cards.
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+To set up a Pagination component, specify the following options: 
+
+- [itemCount](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#itemCount): the total number of elements in the target control. 
+- [pageSize](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#pageSize): the number of items per page. 
+- [allowedPageSizes](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#allowedPageSizes) : available page size choices.
+- [pageIndex](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#pageIndex): page displayed first.
+- [showNavigationButtons](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#showNavigationButtons): navigation button visibility.
+- [showInfo](/Documentation/ApiReference/UI_Components/dxPagination/Configuration/#showInfo): information pane visibility.