Add submission # 6981

#6981

Author: ArduinoBot

registry.txt

@@ -8421,3 +8421,4 @@ https://github.com/junzzhu/esp-mqtt-arduino.git|Contributed|esp-mqtt-arduino
 https://github.com/puzzle-star/EspButtons.git|Contributed|EspButtons
 https://github.com/skr-electronics-lab/OLEDKeyboard.git|Contributed|OLEDKeyboard
 https://github.com/milad-nikpendar/IP5108.git|Contributed|IP5108
+https://github.com/valeriofantozzi/TraccarClient.git|Contributed|TraccarClient