docs(multiselect): Add Keyboard support article

Author: vveesseelliinnaa

controls/multiselect/accessibility-and-internationalization/keyboard-support.md

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+# Keyboard Support
+
+The MultiSelect also follows the [WAI-ARIA best practices](https://www.w3.org/TR/wai-aria-practices/) for implementing the keyboard navigation for its component role and is tested against the popular screen readers.
+
+The keyboard navigation of the MultiSelect is always available, you can use the following keys in order to utilize this functionality:
+
+#### Focus
+* **[Access key + w]** - focuses the widget
+
+#### Closed Popup
+* **[left arrow]** - highlights previous selected item
+* **[right arrow]** - highlights next selected item
+* **[home]** - highlights first selected item
+* **[end]** - highlights last selected item
+* **[delete]** - deletes highlighted item
+* **[backspace]** - deletes previous selected item
+* **[down arrow]** - opens the popup
+* **[esc]** - clears all items
+
+#### Opened Popup
+* **[up arrow]** - highlights previous item
+* **[shift + up arrow]** - selects previous item
+* **[down arrow]** - highlights next item
+* **[shift + down arrow]** - selects next item
+* **[home]** - highlights first item in the popup
+* **[ctrl + shift + home]** - selects items to the beginning
+* **[end]** - highlights last item in the popup
+* **[page up]** - scrolls the popup up
+* **[page down]** - scrolls the popup down
+* **[ctrl + shift]** - end selects items to the end
+* **[enter]** - selects highlighted item
+* **[ctrl + space]** - selects highlighted item
+* **[ctrl]** - a selects all items
+* **[esc]** - closes the popup
+* **[up arrow]** - closes the popup if the first item is highlighted
+* **[esc]** - closes the popup
+
+
+## See Also
+
+ * [Live Demo: RadMultiSelect Keyboard Support](http://demos.telerik.com/aspnet-ajax/multiselect/keyboard-navigation)
+
+ * [Right-to-Left Support]({%slug multiselect/accessibility-and-internationalization/right-to-left-support%})
+
+
+