Update README.md

article 9 added

Author: novlean

README.md

@@ -210,6 +210,7 @@ Technical guides and deep dives into embedded web servers, WebUI integration and
 - [Web File Manager on STM32, ESP32 and Embedded Linux](https://mongoose.ws/articles/building-a-web-file-manager-on-stm32-esp32-embedded-linux/)
 - [Web dashboard on Zephyr RTOS](https://mongoose.ws/articles/web-dashboard-on-zephyr-rtos/)
 - [Limiting TCP/IP RAM usage on STM32](https://mongoose.ws/articles/limiting-tcpip-ram-usage-on-stm32/)
+- [STM32 Ethernet explained](https://mongoose.ws/articles/stm32-ethernet-explained/)
 
 
 ## Contributions