Add AG2 framework examples

[faridun-ag2]

Summary

• Add AG2 (formerly AutoGen) examples alongside existing framework demos: ag2_basic.py, ag2_tool.py, ag2_tools.py, ag2_supervisor.py
• Add ag2[openai] to requirements.txt
• Add AG2 section and docs link to README.md

Why AG2?

AG2 is a community-maintained multi-agent framework with 500K+ monthly PyPI downloads. It supports native multi-provider configuration via LLMConfig — works with GitHub Models, Azure OpenAI, Ollama, and OpenAI.com using the same config pattern as other examples.

AG2 Highlights in These Examples

Pattern	Other Frameworks	AG2 Equivalent
Tool definition	@tool decorator	register_for_llm + register_for_execution
Multi-agent	Supervisor wraps sub-agents as tools	GroupChat with automatic speaker selection
Provider config	Framework-specific client	LLMConfig(api_type="openai", base_url=...)

Test Plan

• ruff check examples/ag2_*.py passes
• All 4 examples run with API_HOST=github
• Existing examples unaffected
• requirements.txt updated with ag2[openai]
• README.md updated with AG2 in frameworks list

[faridun-ag2]

@microsoft-github-policy-service agree company="AG2ai"

[faridun-ag2]

@microsoft-github-policy-service agree company="AG2ai"

[faridun-ag2]

Hey @pamelafox 👋 We've added AG2 framework examples to the repo — basic agent, tool usage, multiple tools, and multi-agent GroupChat. Would love your feedback!