Implement LlamaIndex RAG for Brand & Audience Context

Set up a LlamaIndex-powered RAG system. Index simulated brand guidelines (e.g., Markdown files or PDFs) and audience profile data (e.g., JSON files). Implement a retrieval mechanism that allows agents to query this indexed information to ensure generated ad creatives are compliant and targeted. Demonstrate a 'Copywriter Agent' using RAG to fetch brand tone guidelines before writing ad copy.