Add submission # 6685

#6685

Author: ArduinoBot

registry.txt

@@ -8283,3 +8283,4 @@ https://github.com/leftCoast/LC_extSerial.git|Contributed|LC_extSerial
 https://github.com/tbekas/BLE-Gamepad-Client.git|Contributed|BLE-Gamepad-Client
 https://github.com/me-RK/WiFiCreds.git|Contributed|WiFiCreds
 https://github.com/adafruit/Adafruit_uBlox.git|Recommended|Adafruit uBlox
+https://github.com/positronic57/MCP9808SensorLib.git|Contributed|MCP9808SensorLib