docs: Add FAQ section

[meichuanyi]

This PR adds a comprehensive FAQ section to help users understand Memary concepts and troubleshoot common issues.

Changes

• Added FAQ.md covering:

  • General: What is Memary, how it works, Memory Stream vs Entity Knowledge Store
  • Getting Started: Installation (pip/local), model support (Ollama/OpenAI), credentials setup
  • Features: Routing Agent, Knowledge Graphs, Multi-Graph, custom tools
  • Integration: ChatAgent usage, framework integration, user persona configuration
  • Configuration: Environment variables, local models, database setup (FalkorDB/Neo4j)
  • Troubleshooting: Install issues, Streamlit startup, KG search, Memory Stream updates
  • Help Resources: Documentation links, demo video, social media

• Updated README.md to link the FAQ section

Why

Many users have questions about:

• How Memary's memory system works (Memory Stream vs Entity Knowledge Store)
• Setting up graph databases (FalkorDB/Neo4j)
• Integrating with existing agent frameworks
• Configuring local models via Ollama

This FAQ provides clear answers to help users get started quickly and understand Memary's unique memory layer architecture.

Testing

• FAQ content validated against official documentation at memarydocs
• All code examples tested against quick-start guide
• Installation instructions verified with pip and local setup