Added new demo notifcations to readme. (#1275)

README.md

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 ![](https://github.com/sipsorcery-org/sipsorcery/actions/workflows/sipsorcery-core-mac.yml/badge.svg) 
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+## New WebRTC Demos - Jan 2025
+
+**Connect to OpenAI's Realtime WebRTC Endpoint**
+
+The (WebRTCOpenAI)[https://github.com/sipsorcery-org/sipsorcery/blob/master/examples/WebRTCExamples/WebRTCOpenAI/Program.cs] demonstrates a dotnet only (no native libraries) applicaiton that connects to OpenAI's new [WebRTC Realtime](https://platform.openai.com/docs/guides/realtime-webrtc) endpoint. This demo lets you talk in realtime to ChatGPT and get both a WebRTC audio stream response and a text transcript. Could video avatars be on the way?! A real Max Headroom!
+
+![ChatGPT WebRTC Transcript](./img/openai.png)
+
+**Use WbeRTC + OpenGL for an Audio Scope**
+
+The (WebRTCOpenGL)[https://github.com/sipsorcery-org/sipsorcery/blob/master/examples/WebRTCExamples/WebRTCOpenGL/Program.cs] demonstrates a way to combine some digital signal processing of a WebRTC audio stream and use OpenGL to render a video stream representation of it. It looks way better than it sounds. Try it out!
+
+![AudioScope](./img/audio-scope.png)
+
 ## What Is It?
 
 **This fully C# library can be used to add Real-time Communications, typically audio and video calls, to .NET applications.**