noti: add page (#2544)

pages/common/noti.md

@@ -0,0 +1,15 @@
+# noti
+
+> Monitor a process and trigger a banner notification.
+
+- Display a notification when tar finishes compressing files:
+
+`noti {{tar -cjf example.tar.bz2 example/}}`
+
+- Display a notification even when you put it after the command to watch:
+
+`{{command_to_watch}}; noti`
+
+- Monitor a process by PID and trigger a notification when the PID disappears:
+
+`noti -w {{process_id}}`