Add submission # 5693

#5693

Author: ArduinoBot

registry.txt

@@ -7759,3 +7759,4 @@ https://github.com/robbywm/RobbyIO.git|Contributed|RobbyIO
 https://github.com/cakraawijaya/MQ2_LPG.git|Contributed|MQ2_LPG
 https://github.com/edwiyanto/CreatorKidsIO.git|Contributed|CreatorKidsIO
 https://github.com/cakraawijaya/ESP_FC28.git|Contributed|ESP_FC28
+https://github.com/hasenradball/MCP23008-I2C.git|Contributed|MCP23008-I2C