Add submission # 3723

#3723

Author: ArduinoBot

registry.txt

@@ -6568,3 +6568,4 @@ https://github.com/NicolasNewman/ArgParse.git|Contributed|ArgParse
 https://github.com/alireza7575/MKS_SERVO57.git|Contributed|MKS_SERVO57
 https://github.com/sparkfun/SparkFun_Toolkit.git|Contributed|SparkFun Toolkit
 https://github.com/reiniiriarios/arduino-mqtt-looped.git|Contributed|MQTT_Looped
+https://github.com/littleBitsman/Asynchrony.git|Contributed|Asynchrony