Add submission # 6869

#6869

Author: ArduinoBot

registry.txt

@@ -8336,3 +8336,4 @@ https://github.com/tomorrow56/ESP32FwUploader.git|Contributed|ESP32FwUploader
 https://github.com/7semi-solutions/7Semi-BME690-Arduino-Library.git|Contributed|7Semi BME690
 https://github.com/Glinek/picoEEPROM.git|Contributed|picoEEPROM
 https://github.com/deepanshu-deshwal/SL002_DHT11.git|Contributed|SL002_DHT11
+https://github.com/abcdaaaaaaaaa/MG811DataScience.git|Contributed|MG811SpaceData