Add protocol specification document and fix package size

Add protocol specification document and fix package size

ABB Aurora library

Arduino, esp32 and esp8266 library for ABB (ex PowerOne) Aurora Inverter, implement a full methods to retrieve data from the Inverter via RS-485.
This library is currently on production on some devices, you can find the code of Web Monitor on my github.

Fix name by removing Arduino word

ABB Aurora library first stable and tested release.

Arduino, esp32 and esp8266 library for ABB (ex PowerOne) Aurora Inverter, implement a full methods to retrieve data from the Inverter via RS-485.
This library is currently on production on some devices, you can find the code of Web Monitor on my github.