LT8920

Arduino Library for LT8920 2.4G RF Transceiver
This project is based on LT8910 Project: https://github.com/534659123/LT8910
Change List:

1. fix some small bugs.
2. works on ESP8266 Arduino.
3. clean some notes.
4. add dump_register method for debug.
5. remove some useless files.

Note: Data rate may have issues when setting other value than 1Mbps.