Add submission # 6849

#6849

Author: ArduinoBot

registry.txt

@@ -8322,3 +8322,4 @@ https://github.com/Sensirion/arduino-i2c-sps30.git|Contributed|Sensirion I2C SPS
 https://github.com/Sensirion/arduino-uart-sps30.git|Contributed|Sensirion UART SPS30
 https://github.com/CharminJunior/UOS.git|Contributed|UOS
 https://github.com/adafruit/Adafruit_SPA06_003.git|Recommended|Adafruit SPA06_003
+https://github.com/NitrofMtl/DUERS485DMA.git|Contributed|DUERS485DMA