Add submission # 6964

#6964

Author: ArduinoBot

registry.txt

@@ -8411,3 +8411,4 @@ https://github.com/stm32duino/ISM330IS.git|Contributed|STM32duino ISM330IS
 https://github.com/stm32duino/ILPS22QS.git|Contributed|STM32duino ILPS22QS
 https://github.com/fulda1/SUSI2.git|Contributed|SUSI2
 https://github.com/Harmony-Maker-Club/AIP1640_LED_Matrix.git|Contributed|AIP1640_LED_Matrix
+https://github.com/MISTERNEGATIVE21/QuectelEC200U_CN.git|Contributed|QuectelEC200U_CN