Merge pull request #622 from cesanta/novlean-patch-1

Update README.md

Author: novlean

README.md

@@ -81,3 +81,4 @@ Detailed articles and expert content focused on embedded network technologies:
 - [Building Embedded Web Device Dashboards](https://mongoose.ws/articles/building-embedded-web-device-dashboard/)
 - [ESP32 Device Dashboard: A Step-by-Step Guide for Developers](https://mongoose.ws/articles/esp32-device-dashboard/)
 - [How to build an STM32 Web Dashboard](https://mongoose.ws/articles/stm32-device-dashboard/)
+- [STM32 WebSocket Guide](https://mongoose.ws/articles/stm32-websocket-guide/)