Add CLAUDE.md configuration file with comprehensive project guidelines

[raegAI]

This PR adds a comprehensive CLAUDE.md configuration file that defines code style guidelines, review criteria, project-specific rules, and preferred patterns for the Hyperliquid Python SDK.

Key Features

• Project Overview: Clear description of the SDK's purpose
• Code Style Guidelines: Python version requirements, type hints, formatting with Black
• Development Workflow: Poetry commands, testing with pytest, linting procedures
• Review Criteria: API compatibility, type safety, security considerations
• Project-Specific Rules: API structure patterns, signing requirements, configuration handling
• Preferred Patterns: TypedDict usage, error handling, WebSocket management
• Testing Requirements: pytest with VCR.py, coverage reporting, test conventions
• Documentation Standards: README maintenance, example structure, error messaging

Codebase Analysis

This configuration was created by analyzing the existing codebase patterns including:

• hyperliquid/ module structure (api.py, info.py, exchange.py, websocket_manager.py)
• utils/ directory (types.py, constants.py, signing.py, error.py)
• examples/ directory usage patterns
• tests/ structure and VCR cassettes
• pyproject.toml configuration
• Makefile commands

Integration

This file will guide all future Claude Code operations and ensures consistent, secure, and high-quality code generation aligned with existing project patterns.

Closes #7