Added Infineon MOTIX BTN99x0 library to registry (#2218)

Author: jaenrig-ifx

repositories.txt

@@ -2051,6 +2051,7 @@ https://github.com/Industruino/Indio
 https://github.com/Industruino/UC1701
 https://github.com/INFICON-Spot/inficon-spot-lib
 https://github.com/Infineon/arduino-btn99x0
+https://github.com/Infineon/arduino-motix-btn99x0
 https://github.com/Infineon/arduino-high-side-switch
 https://github.com/Infineon/arduino-optiga-trust-m
 https://github.com/Infineon/arduino-optiga-trust-x