Add library RUI3-Arduino-Library (#4445)

* Add RAKwireless_RAK14000_EPD_2_13

* Add RUI3-Arduino-Library

RAKWireless library for communication over UART with RUI3 based WisDuo modules.

Author: beegee-tokyo

repositories.txt

@@ -1007,6 +1007,7 @@ https://github.com/beegee-tokyo/SX126x-Arduino
 https://github.com/beegee-tokyo/VNCL4020C-Arduino
 https://github.com/beegee-tokyo/WisBlock-API
 https://github.com/beegee-tokyo/WisBlock-API-V2
+https://github.com/beegee-tokyo/RUI3-Arduino-Library
 https://github.com/beetlikeyg087/MFUthings
 https://github.com/Beirdo/Arduino-FRAM-Cache
 https://github.com/Beirdo/Arduino-LIN