Add LLM and AI workflow examples section

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Overview

Add a new section to the README and repository for LLM-related examples and AI workflow libraries.

Proposed Content

LLM Examples

• OpenAI API integration (GPT-4, ChatGPT)
• Anthropic Claude API
• LangChain workflows
• LlamaIndex for RAG applications
• Hugging Face Transformers
• Prompt engineering examples
• Vector database integration (Pinecone, Chroma, FAISS)
• Agent frameworks (AutoGPT, LangGraph)

AI Workflow Libraries

• Instructor (structured outputs)
• Guidance (constrained generation)
• DSPy (prompt optimization)
• LiteLLM (unified API)
• Semantic Kernel

Tasks

• Add LLM section to README
• Create example files for popular LLM libraries
• Add necessary dependencies to pyproject.toml
• Document usage and best practices
• Include error handling and rate limiting examples

Reference

Popular LLM libraries to consider:

• openai
• anthropic
• langchain
• llama-index
• transformers
• instructor
• guidance
• dspy-ai