Update MS-104Z.md (Koenkk#957)

Add pairing procedure

Author: Boia11

Diff for: docs/devices/MS-104Z.md

@@ -17,7 +17,8 @@ description: "Integrate your Moes MS-104Z via Zigbee2MQTT with whatever smart ho
 
 ## Notes
 
-None
+### Pairing 
+Press switch to turn ON/OFF cycle for 5 times (keep time interval not too short) until the beep sounds continuously and rapidly for enter in pairing mode.
 
 
 ## Exposes