tailscale-file: add page (#7844)

pages/common/tailscale-file.md

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+# tailscale file
+
+> Send files across connected devices on a Tailscale network.
+> It currently does not support sending files to devices owned by other users even on the same Tailscale network.
+> More information: <https://tailscale.com/kb/1106/taildrop/>.
+
+- Send a file to a specific node:
+
+`sudo tailscale file cp {{path/to/file}} {{hostname|ip}}:`
+
+- Store files that were sent to the current node into a specific directory:
+
+`sudo tailscale file get {{path/to/directory}}`