Add submission # 6910

#6910

Author: ArduinoBot

registry.txt

@@ -8371,3 +8371,4 @@ https://github.com/Sensirion/arduino-i2c-sen68.git|Contributed|Sensirion I2C SEN
 https://github.com/ayresnet/AyresShell.git|Contributed|AyresShell
 https://github.com/7semi-solutions/7Semi-ADS1xx5-Arduino-Library.git|Contributed|7Semi_ADS1xx5
 https://github.com/tomrodinger/Servomotor_Arduino_Library.git|Contributed|Servomotor
+https://github.com/PhoenixSmaug/AFMotor-Shield-R4-Compatible.git|Contributed|Adafruit Motor Shield R4 Compatible