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

packages/test-utils/README.md

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+# @the-order/test-utils
+
+Shared testing utilities for The Order monorepo.
+
+## Usage
+
+```typescript
+import { createTestUser, createTestDocument, sleep } from '@the-order/test-utils';
+
+const user = createTestUser({ email: 'custom@example.com' });
+const doc = createTestDocument({ title: 'My Document' });
+await sleep(1000);
+```
+
+## Available Utilities
+
+- `createTestUser()` - Create a test user object
+- `createTestDocument()` - Create a test document object
+- `sleep()` - Wait for a specified number of milliseconds
+- `createMockResponse()` - Create a mock fetch response
+