Add Cooper&Hunter CH-RH12MASTWM-230VI to supported devices

Author: RobHofmann

supported-devices.md

@@ -42,6 +42,7 @@ Tested on the following hardware:
 - CASCADE BORA-CWH09AAB
 - Cooper&Hunter Alpha Inverter Series CH-S12FTXE-NG(I)
 - Cooper&Hunter Vital Inverter Series CH-S07FTXF2-NG, CH-S09FTXF2-NG, CH-S18FTXF2-NG (encryption version 2)
+- Cooper&Hunter CH-RH12MASTWM-230VI
 - Copmax Air-Air Heatpump GWH12QC-K6DNA5F 3.5kW
 - Heiwa Essentiel ZEN+ HMIS2-25P-V2 with WI-FI module GRJWB04-J (encryption version 2)
 - Innova HVAC