Add submission # 6535

#6535

Author: ArduinoBot

registry.txt

@@ -8277,3 +8277,4 @@ https://github.com/dejwk/roo_threads.git|Contributed|roo_threads
 https://github.com/faisalill/BMP390.git|Contributed|BMP390
 https://github.com/RacoonX65/CalibrationLib.git|Contributed|CalibrationLib
 https://github.com/phuongnamzz/HLK-LD2410S.git|Contributed|HLK-LD2410S
+https://github.com/danel32/Arduino-Library-for-MAX7300.git|Contributed|MAX7300