Add submission # 6904

#6904

Author: ArduinoBot

registry.txt

@@ -8365,3 +8365,6 @@ https://github.com/JackHat1/MT07_CAN_Project.git|Contributed|MT07_CAN_Library
 https://github.com/7semi-solutions/7Semi-HX711-Arduino-Library.git|Contributed|7Semi_HX711
 https://github.com/Rmin-code2005/sh1106-1306_ui_assistance.git|Contributed|oled_graphic_assistance
 https://github.com/Rmin-code2005/sparkey_gyro_I2C.git|Contributed|king_Armin_sparkyTDAxis12_I2C_lib
+https://github.com/Sensirion/arduino-i2c-sen63c.git|Contributed|Sensirion I2C SEN63C
+https://github.com/Sensirion/arduino-i2c-sen65.git|Contributed|Sensirion I2C SEN65
+https://github.com/Sensirion/arduino-i2c-sen68.git|Contributed|Sensirion I2C SEN68