add YFROBOT PS2UART library link (#7232)

https://github.com/YFROBOT-TM/Yfrobot-PS2UART-Library

Author: YFROBOTZL

repositories.txt

@@ -7562,6 +7562,7 @@ https://github.com/YFROBOT-TM/Yfrobot-Motor-Driver-Library
 https://github.com/YFROBOT-TM/Yfrobot-Valon3-Library
 https://github.com/YFROBOT-TM/Yfrobot-TTS-Library
 https://github.com/YFROBOT-TM/Yfrobot-Motor-Driver-IIC1508-Library
+https://github.com/YFROBOT-TM/Yfrobot-PS2UART-Library
 https://github.com/yhur/ConfigPortal32
 https://github.com/yhur/ConfigPortal8266
 https://github.com/YiannisBourkelis/Uptime-Library