EMS-ESP32/doc/Domoticz

to install the plugin:
- copy the directory 'nefit' to the domoticz/plugins directory
- make sure that 'Accept new Hardware Devices' is enabeled in settings/sysem
- create new hardware with type 'Nefit EMS-ESP with Proddy firmware'
- set MQTT server and port

The plugin crrently creates 3 devices:
- a room temperature meter
- a system pressure meter
- a thermostat setpoint control