Add Keyboard Layout Selection doc and media.

content/first-boot/keyboard-layout-selection.md

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+## Keyboard Layout
+
+Select the language and layout for your keyboard. *You can change or add more later.*
+
+![Select keyboard layout](../images/first-boot/keyboard-layout-selection.png)
+
+If you do not find the correct keyboard layout, click the ⋮ button and type your language / keyboard layout like in the above image.
+
+Upon finding and selecting the correct keyboard layout, click Next.