Added AG2 community integration example and Quickstart pointer

[VasiliyRad]

Summary

Added a lightweight AG2 (formerly AutoGen) community integration example to the docs and surfaced it in Quickstart “Next Steps” for discoverability. This aligns with AG2’s Crawl4AI support and gives users a ready‑to‑copy agent integration snippet.

List of files changed and why

examples.md: Added a “Community Integrations” section with an AG2 example using Crawl4AITool and a Pydantic schema.
quickstart.md: Added a “Code Examples” bullet pointing readers to the AG2 community integration snippet.

How Has This Been Tested?

Documentation changes only

Checklist:

• [ NA ] My code follows the style guidelines of this project
• [ X ] I have performed a self-review of my own code
• [ NA ] I have commented my code, particularly in hard-to-understand areas
• [ X ] I have made corresponding changes to the documentation
• [ NA ] I have added/updated unit tests that prove my fix is effective or that my feature works
• [ NA ] New and existing unit tests pass locally with my changes