Add submission # 6688

#6688

Author: ArduinoBot

registry.txt

@@ -8286,3 +8286,4 @@ https://github.com/adafruit/Adafruit_uBlox.git|Recommended|Adafruit uBlox
 https://github.com/positronic57/MCP9808SensorLib.git|Contributed|MCP9808SensorLib
 https://github.com/AvantMaker/ESP32_AI_Connect.git|Contributed|ESP32_AI_Connect
 https://github.com/Jodeenio/74HC595Plus.git|Contributed|74HC595Plus
+https://github.com/sstaub/ST7565DOG.git|Contributed|ST7565DOG