Merge pull request vinta#3080 from vvlrff/add-ag2

docs(ai-agents): add ag2 to AI Agents Orchestration

Author: JinyangWang27

README.md

@@ -134,6 +134,7 @@ _Libraries for building AI applications, LLM integrations, and autonomous agents
   - [sentry-skills](https://github.com/getsentry/skills) - Python-focused engineering skills for code review, debugging, and backend workflows.
   - [trailofbits-skills](https://github.com/trailofbits/skills) - Python-friendly security skills for auditing, testing, and safer backend development. Also [skills-curated](https://github.com/trailofbits/skills-curated).
 - Orchestration
+  - [ag2](https://github.com/ag2ai/ag2) - An open-source AgentOS for multi-agent orchestration and building agentic AI systems.
   - [autogen](https://github.com/microsoft/autogen) - A programming framework for building agentic AI applications.
   - [bub](https://github.com/bubbuild/bub) - A lightweight, hook-first Python framework for channel-native agents that live alongside people.
   - [crewai](https://github.com/crewAIInc/crewAI) - A framework for orchestrating role-playing autonomous AI agents for collaborative task solving.