Add submission # 7218

#7218

Author: ArduinoBot

registry.txt

@@ -8560,3 +8560,4 @@ https://github.com/egnor/ok_arduino_little_layout.git|Contributed|OK Little Layo
 https://github.com/ienai-SPACE/ADC128S_Arduino.git|Contributed|IENAI ADC128S
 https://github.com/vicharak-in/shrike_arduino.git|Contributed|Shrike
 https://github.com/sensebox/DNMSI2C.git|Contributed|DNMSI2C
+https://github.com/szilvasyz/DCF77FreeRTOS.git|Contributed|DCF77FreeRTOS