nordvpn: add page (#6393)

pages/linux/nordvpn.md

@@ -0,0 +1,24 @@
+# nordvpn
+
+> Command-line interface for NordVPN.
+> More information: <https://nordvpn.com/download/linux/>.
+
+- Interactively log into a NordVPN account:
+
+`nordvpn login`
+
+- Display the connection status:
+
+`nordvpn status`
+
+- Connect to the nearest NordVPN server:
+
+`nordvpn connect`
+
+- List all available countries:
+
+`nordvpn countries`
+
+- Connect to a NordVPN server in a specific country:
+
+`nordvpn connect {{Germany}}`