Add README with project overview and quick start guide

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

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+# Price Hunter
+
+A self-hosted price comparison engine. Search across multiple online stores simultaneously, compare prices, and find the cheapest option — all from a single, clean interface.
+
+## Features
+
+- **Unified search** — One search bar, all your stores, results sorted by price
+- **Store management** — Add stores with CSS selector configs, organize by category
+- **Store testing** — Per-store test pages to verify scraping before going live
+- **Categories & groups** — Filter searches by category or custom store groups
+- **Scrape health** — Monitor success rates, response times, and error logs per store
+- **Self-hosted** — All data stays local. No ads, no tracking, no external dependencies.
+
+## Quick Start
+
+### Development
+
+```bash
+npm install
+cd src/client && npm install && cd ../..
+npm run dev
+```
+
+Open http://localhost:5173 (frontend) — API runs on http://localhost:3000.
+
+### Docker
+
+```bash
+docker compose up
+```
+
+Open http://localhost:3000.
+
+## Tech Stack
+
+- **Backend:** Node.js, Fastify, sql.js (SQLite)
+- **Frontend:** SvelteKit, Tailwind CSS
+- **Scraping:** Cheerio (CSS selectors)
+- **Deployment:** Docker
+
+## Adding a Store
+
+1. Go to **Stores** > **Add Store**
+2. Fill in the store name, base URL, and search URL (use `{query}` as the search term placeholder)
+3. Define CSS selectors for: product container, name, price, link, and optionally image
+4. Save and use the **Test** page to verify results
+5. Enable the store to include it in searches
+
+## License
+
+MIT