Added support for Adeunis MODBUS

Now you can read data from MODBUS slaves via Adeunis MODBUS device. In the first round, we support DIRIS meters from Socomec (https://www.socomec.us/metering-monitoring-and-power-quality/) but we are ready to add support for other MODBUS compatible devices you use in your project (https://en.wikipedia.org/wiki/Modbus).