Add submission # 6451

#6451

Author: ArduinoBot

registry.txt

@@ -8225,3 +8225,4 @@ https://github.com/ardlib/bosejis_PKAE_Timer.git|Contributed|PKAE_Timer
 https://github.com/saveme1507/EasyMQTT.git|Contributed|EasyMQTT
 https://github.com/MAKE-arduino/M_RGB.git|Contributed|M_RGB
 https://github.com/sciosense/ufm01-arduino.git|Contributed|ScioSense_UFM01
+https://github.com/llcesselx/lcd595.git|Contributed|LCD595-ISU