Add submission # 5979

#5979

Author: ArduinoBot

registry.txt

@@ -7916,3 +7916,4 @@ https://github.com/robinz-labs/digishow-rioc.git|Contributed|DigiShow RIOC
 https://github.com/RobTillaart/LTC2485.git|Contributed|LTC2485
 https://github.com/oskozach/MsTime.git|Contributed|MsTime
 https://github.com/MYCAMEL222/AbleTP.git|Contributed|AbleTP
+https://github.com/dac1e/Dcf77Receiver.git|Contributed|Dcf77Receiver