Update TS130F.md (Koenkk#472)

Calibration process described

docs/devices/TS130F.md

@@ -23,6 +23,13 @@ description: "Integrate your TuYa TS130F via Zigbee2MQTT with whatever smart hom
 
 * `invert_cover`: By default the position/tilt values mean: open = 100, closed = 0. This can be inverted by setting this option to true (so open = 0, close = 100).
 
+### Calibration
+
+* Open curtains completly
+* Send calibration command to the switch: mosquitto_pub -d -m 'on' -t 'zigbee2mqtt/Living_Room_Sunblind_Switch/set/calibration'
+* Press on close button on the switch, wait until curtains are fully closed
+* Send calibration command to the switch: mosquitto_pub -d -m 'off' -t 'zigbee2mqtt/Living_Room_Sunblind_Switch/set/calibration'
+
 
 ## Manual Home Assistant configuration
 Although Home Assistant integration through [MQTT discovery](../integration/home_assistant) is preferred,