Add SparkFun_Apple_Accessory_Arduino_Library (#6695)

Add https://github.com/sparkfun/SparkFun_Apple_Accessory_Arduino_Library

Author: PaulZC

repositories.txt

@@ -6433,6 +6433,7 @@ https://github.com/sparkfun/SparkFun_Alphanumeric_Display_Arduino_Library
 https://github.com/sparkfun/SparkFun_Ambient_Light_Sensor_Arduino_Library
 https://github.com/sparkfun/SparkFun_APDS-9960_Sensor_Arduino_Library
 https://github.com/sparkfun/SparkFun_APDS9301_Library
+https://github.com/sparkfun/SparkFun_Apple_Accessory_Arduino_Library
 https://github.com/sparkfun/SparkFun_ARGOS_ARTIC_R2_Arduino_Library
 https://github.com/sparkfun/SparkFun_AS108M_Fingerprint_Scanner_Arduino_Library
 https://github.com/sparkfun/SparkFun_AS3935_Lightning_Detector_Arduino_Library