add demos/proactive-audio to the readme

Author: hapticdata

README.md

@@ -16,6 +16,13 @@ $ npm install && npm start
 
 We have provided several example applications on other branches of this repository:
 
+New demos with GenAI SDK:
+
+- [demos/proactive-audio](https://github.com/google-gemini/multimodal-live-api-web-console/tree/demos/proactive-audio) - demonstrates the Live API's [proactive audio feature](https://ai.google.dev/gemini-api/docs/live-guide#proactive-audio)
+
+
+Original demos:
+
 - [demos/GenExplainer](https://github.com/google-gemini/multimodal-live-api-web-console/tree/demos/genexplainer)
 - [demos/GenWeather](https://github.com/google-gemini/multimodal-live-api-web-console/tree/demos/genweather)
 - [demos/GenList](https://github.com/google-gemini/multimodal-live-api-web-console/tree/demos/genlist)