airmon-ng: add page (#4974)

pages/common/airmon-ng.md

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+# airmon-ng
+
+> Activate monitor mode on wireless network devices.
+> More information: <https://www.aircrack-ng.org/doku.php?id=airmon-ng>.
+
+- List wireless devices and their statuses:
+
+`sudo airmon-ng`
+
+- Turn on monitor mode for a specific device:
+
+`sudo airmon-ng start {{wlan0}}`
+
+- Kill disturbing processes that use wireless devices:
+
+`sudo airmon-ng check kill`
+
+- Turn off monitor mode for a specific network interface:
+
+`sudo airmon-ng stop {{wlan0mon}}`