docs: add FAQ section

[meichuanyi]

Changes

• Added a comprehensive FAQ section to the README covering:
  • General: What mahilo is, how it differs from LangGraph/CrewAI, license
  • Setup & Configuration: Installation, LLM provider support, local models
  • Agent Development: Custom agents, cross-framework integration, communication
  • Human-in-the-Loop: Supervision policies, built-in policy types
  • Troubleshooting: WebSocket issues, agent unresponsiveness, voice features

Rationale

The README is comprehensive but lacks a quick-reference FAQ section. This addition helps new users quickly find answers to common questions about setup, agent development, and troubleshooting without digging through the full documentation.

Checklist

• Documentation only change (README.md)
• FAQ content is specific to mahilo's features and architecture
• No breaking changes

[meichuanyi]

Hi! Just checking in on this PR. The FAQ section adds value for new users who have common questions about mahilo. Happy to make any adjustments if needed. Thanks! 🙏

[meichuanyi]

@maintainer 请问有空 review 这个文档 PR 吗？谢谢！