Initial commit: multimodal RAG guide with Claude Code

Prompt-driven guide for building multimodal search using
Gemini Embedding 2 + Pinecone + Claude Code. Includes example
data (NASA public domain), step-by-step prompts, concepts
explainer, cost breakdown, and troubleshooting guide.

costs.md

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+# What Does This Cost?
+
+Short answer: you can do this entire guide for free or near-free.
+
+## Claude Code
+
+You need a Claude subscription that includes Claude Code.
+
+- **Claude Pro ($20/month):** Includes Claude Code with usage limits.
+- **Claude Max ($100/month or $200/month):** Higher limits.
+
+If you already have a Claude subscription, there is no extra cost.
+Claude Code handles building the app AND answering questions
+based on your search results.
+
+## Google Gemini Embedding 2 (for embeddings only)
+
+We use Google's Gemini Embedding 2 to convert your content into
+searchable embeddings. We do NOT use Gemini as a language model.
+Claude does the thinking. Gemini just creates the fingerprints.
+
+- **Free tier:** Available through Google AI Studio with rate limits
+  (1,500 requests per day)
+- **Paid:** $0.20 per million tokens
+
+For this guide with 7 example files, you will use roughly 10-20
+requests total. The free tier is more than enough.
+
+Why Gemini Embedding 2 and not Voyage (Anthropic's embeddings)?
+Because Gemini Embedding 2 supports text, images, AND video natively.
+Voyage supports text and images but not video. For a multimodal guide,
+the broadest format support wins.
+
+## Pinecone Vector Database (free tier)
+
+Pinecone's free tier includes:
+
+- **Free:** 1 project, 5 indexes, 100,000 vectors
+- **No credit card required**
+
+For this guide, we store about 15-30 vectors (one per chunk of
+content). You could store thousands of documents and still stay
+within the free tier.
+
+## Total cost for this guide
+
+| Service | What it does | Cost |
+|---------|-------------|------|
+| Claude Code | Builds the app, answers questions | Part of your subscription |
+| Gemini Embedding 2 | Converts content to searchable vectors | Free (well within free tier) |
+| Pinecone | Stores and searches vectors | Free (well within free tier) |
+| **Total** | | **$0 extra** |
+
+## What if you want to scale up?
+
+If you move beyond the example and want to index thousands of
+documents, here is what the costs look like:
+
+| Scale | Gemini embeddings | Pinecone | Monthly total |
+|-------|-------------------|----------|---------------|
+| 100 documents | Free | Free | $0 |
+| 1,000 documents | ~$0.50 | Free | ~$0.50 |
+| 10,000 documents | ~$5 | Free | ~$5 |
+| 100,000 documents | ~$50 | $70+ (Starter plan) | ~$120 |
+
+For most personal and small business use cases, you will stay
+comfortably in the free tier.