Added Generic double switch with timers and power monitoring

DEVICES.md

@@ -308,6 +308,8 @@ of device.
 - Generic smartplug with some additional encoded schedule info.
   _confirmed working as a simple switch and timer with Kashimura KJ-173_
 - Generic double switch with timers (confirmed with Living dual switch and another v2 variant with Avatto dual switch)
+- Generic double switch with timers and power monitoring on whole device
+  _confirmed working as simple switches, timers and whole device power monitoring with MG-MD04W_
 - Generic triple and quad switches (confirmed with Songam wall switches)
 - Generic triple switch with timers.
 - Simple switch - a switch only, can be a fallback for many other unsupported devices, to allow just power to be switched on/off.