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

services/dataroom/README.md

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+# Dataroom Service
+
+Service for secure VDR (Virtual Data Room), deal rooms, and document access control.
+
+## Features
+
+- Deal space management
+- Folder ACLs (OPA policies)
+- Watermarking
+- Expiring links
+- Activity logs
+- Integration with finance service for deal states
+
+## Development
+
+```bash
+# Install dependencies
+pnpm install
+
+# Run development server
+pnpm dev
+
+# Build
+pnpm build
+
+# Start production server
+pnpm start
+```
+
+## API Endpoints
+
+- `GET /health` - Health check
+- `POST /deals` - Create deal room
+- `GET /deals/:dealId` - Get deal room
+- `POST /deals/:dealId/documents` - Upload document
+- `GET /deals/:dealId/documents/:documentId/url` - Get presigned URL
+
+## Environment Variables
+
+- `PORT` - Server port (default: 4004)
+- `DATABASE_URL` - PostgreSQL connection string
+- `STORAGE_BUCKET` - Storage bucket for documents
+- `OPA_URL` - Open Policy Agent URL for access control
+