nmcli: add page (#1547)

pages/linux/nmcli.md

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+# nmcli
+
+> A command line tool for controlling NetworkManager.
+
+- List all NetworkManager connections (shows name, uuid, type and device):
+
+`nmcli connection`
+
+- Activate a connection by specifying an uuid:
+
+`nmcli connection up uuid {{uuid}}`
+
+- Deactivate a connection:
+
+`nmcli connection down uuid {{uuid}}`
+
+- Print statuses of network interfaces:
+
+`nmcli device status`