Add README.md

README.md

+# Yu-Gi-Oh! Artwork Fetcher
+
+A simple Python CLI tool to:
+
+1. **Export** card data from a `.cdb` SQLite database into JSON  
+2. **Dump** card IDs into a CSV (preserving any “official” mappings)  
+3. **Fetch** card artworks (with support for multiple art variants per card)
+
+## 📋 Requirements
+
+- **Python 3.8+**
+- **Pip** for installing dependencies
+
+### Python Dependencies
+
+```text
+requests
+tqdm