feat: add README.md with project description and features

Co-authored-by: aider (openai/nsloth/Qwen3-Coder-Next) <aider@aider.chat>

README.md

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+# Grocery Receipt Tracker
+
+A database application to track your grocery receipts and compare prices between stores and over time.
+
+## Overview
+
+This project helps you:
+- Record and store your grocery receipts
+- Track item prices across different stores
+- Analyze price trends over time
+- Compare costs to find the best deals
+
+## Features
+
+- Store receipt details (date, store, items, prices)
+- Compare prices for the same items across different stores
+- Visualize price changes over time
+- Identify cost-saving shopping patterns
+
+## Getting Started
+
+[Add instructions here for installation and setup]
+
+## Usage
+
+[Add usage instructions here]
+
+## Contributing
+
+[Add contribution guidelines here]
+
+## License
+
+[Add license information here]