Added arduino-btn99x0 library to registrar (#2217)

Author: jaenrig-ifx

repositories.txt

@@ -2050,6 +2050,7 @@ https://github.com/Industruino/FRAM
 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-high-side-switch
 https://github.com/Infineon/arduino-optiga-trust-m
 https://github.com/Infineon/arduino-optiga-trust-x