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I've also updated the second group chat example to move termination and use the new run_group_chat.

Also, I suggest to remove:

• Code style and linting - section. Let's leave it on contributing guide
• Cite the project - we have CITATION.cff already

And move Contributors Wall to the down of README. So, the ending sections order I suggest:
– Related papers
– Announcements
– License - can we use https://img.shields.io/github/license/ag2ai/ag2.svg shield instead?
– Contributors Wall

• Code style and linting - section. Let's leave it on contributing guide
  Contributors guide is missing that information. Let's update contributors guide with that information first and next delete it from Readme.

• Cite the project - we have CITATION.cff already
  Format is a bit different, also it is common for developers to just check README and ignore CITATION.cff. Let me think if we can optimize it in future.

And move Contributors Wall to the down of README. So, the ending sections order I suggest: – Related papers – Announcements – License - can we use https://img.shields.io/github/license/ag2ai/ag2.svg shield instead? – Contributors Wall
Moved down but not completely to the bottom. The legal section should probably be last (along with the related citation section)