Add config_flow for configuration via Integrations UI #28
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Mostly taken from my own attempt at creating the same custom component - https://github.com/YodaDaCoda/hass-solarman-modbus/
I note that your README.md includes a configuration parameter
scan_interval
which appears unused. I've not attempted to add that parameter.NB: during config flow, a connection attempt is made to the specified host/port combination. If this fails (e.g. because you're setting it up at night and the inverter/sensor is powered off) then setup will fail and the integration will not be added.
Fixes #15
My editor also removed some excess whitespace, I hope that's not an issue.