Add submission # 5548

#5548

Author: ArduinoBot

registry.txt

@@ -7668,3 +7668,4 @@ https://github.com/KriBielinski/PrecDueTimer.git|Contributed|PrecDueTimer
 https://github.com/KriBielinski/InterruptStepper.git|Contributed|InterruptStepper
 https://github.com/SWITCHSCIENCE/QZSSDCX.git|Contributed|QZSSDCX
 https://github.com/Geekble-Maker/Geekble_MotorOrgel.git|Contributed|Geekble_MotorOrgel
+https://github.com/median-dispersion/Non-Blocking-Melody.git|Contributed|Non-Blocking Melody