Add submission # 5991

#5991

Author: ArduinoBot

registry.txt

@@ -7924,3 +7924,4 @@ https://github.com/ImSpeddy/L298Nlib.git|Contributed|L298Nlib
 https://github.com/4211421036/githubiot.git|Contributed|githubiot
 https://github.com/adafruit/Adafruit-DVI-HSTX.git|Recommended|Adafruit DVI HSTX
 https://github.com/christosneg/concurrentPID.git|Contributed|concurrentPID
+https://github.com/Mourty/ExtendedTime.git|Contributed|ExtendedTime