Add submission # 2221

#2221

Author: ArduinoBot

registry.txt

@@ -5515,3 +5515,4 @@ https://github.com/khoih-prog/AsyncESP32_Ethernet_Manager.git|Contributed|AsyncE
 https://github.com/shyd/Arduino-SerialCommand.git|Contributed|SerialCommand Advanced
 https://github.com/dlyckelid/IOExpander-TLA2518.git|Contributed|TLA2518
 https://github.com/Infineon/arduino-motix-btn99x0.git|Contributed|motix-btn99x0
+https://github.com/khoih-prog/ESP32_Ethernet_Manager.git|Contributed|ESP32_Ethernet_Manager