Update README.md to provide a comprehensive overview of The Order monorepo, including repository structure, quickstart guide, development workflow, and contribution guidelines.

docs/product/README.md

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+# Product Documentation
+
+Product documentation, roadmaps, and PRDs for The Order.
+
+## Contents
+
+- **Roadmaps** - Product roadmaps and feature planning
+- **PRDs** - Product Requirements Documents
+- **User Guides** - End-user documentation
+- **API Documentation** - API reference and guides
+
+## Roadmaps
+
+See `roadmaps/` directory for product roadmaps.
+
+## PRDs
+
+See `prds/` directory for Product Requirements Documents.
+
+## User Guides
+
+See `user-guides/` directory for end-user documentation.
+
+## API Documentation
+
+See `api/` directory for API documentation and reference.
+