Add submission # 5593

#5593

Author: ArduinoBot

registry.txt

@@ -7700,3 +7700,4 @@ https://github.com/SWITCHSCIENCE/ZPA4756_0311A_R.git|Contributed|ZPA4756-0311A-R
 https://github.com/Stutchbury/InputEvents.git|Contributed|InputEvents
 https://github.com/ropg/LVGL_CYD.git|Contributed|LVGL_CYD
 https://github.com/Moarbue/MAX31855-library.git|Contributed|MAX31855 Library
+https://github.com/QuickSpot/walter-arduino.git|Contributed|WalterModem