Add submission # 6613

#6613

Author: ArduinoBot

registry.txt

@@ -8222,3 +8222,4 @@ https://github.com/npuckett/WebGUI.git|Contributed|WebGUI
 https://github.com/kolod/Arduino-Simple-Modbus-Slave.git|Contributed|SimpleModbusSlave
 https://github.com/EmotiBit/EmotiBit_DSPFilters.git|Contributed|EmotiBit_DSPFilters
 https://github.com/EmotiBit/BrainflowSpO2Algorithm.git|Contributed|BrainflowSpO2Algorithm
+https://github.com/m5stack/M5Unit-TUBE.git|Contributed|M5Unit-TUBE