Add submission # 3700

#3700

Author: ArduinoBot

registry.txt

@@ -6552,3 +6552,4 @@ https://github.com/dejwk/roo_display.git|Contributed|roo_display
 https://github.com/dejwk/roo_material_icons.git|Contributed|roo_material_icons
 https://github.com/joshua-8/TMC7300.git|Contributed|TMC7300
 https://github.com/chrmlinux/tinyCommand.git|Contributed|tinyCommand
+https://github.com/KurtE/MemoryHexDump.git|Contributed|MemoryHexDump