Add CHANGELOG.md

Document all changes including Docker deployment feature
Follow Keep a Changelog format with semantic versioning
Include template for future releases

CHANGELOG.md

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+# Changelog
+
+All notable changes to the AI-Trader project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Complete Docker deployment support with containerization
+- Docker Compose orchestration for easy local deployment
+- Multi-stage Dockerfile with Python 3.10-slim base image
+- Automated CI/CD pipeline via GitHub Actions for release builds
+- Docker images published to GitHub Container Registry (ghcr.io)
+- Comprehensive Docker documentation (docs/DOCKER.md)
+- Release process documentation (docs/RELEASING.md)
+- CLAUDE.md repository guidance for development
+- Docker deployment section in main README
+- Environment variable configuration via docker-compose
+- Sequential startup script (entrypoint.sh) for data fetch, MCP services, and trading agent
+- Volume mounts for data and logs persistence
+- Pre-built image support from ghcr.io/hkuds/ai-trader
+
+### Changed
+- Updated .env.example with Docker-specific configuration and paths
+- Updated .gitignore to exclude git worktrees directory
+- Removed deprecated version tag from docker-compose.yml
+
+### Fixed
+- Docker Compose configuration now follows modern best practices (version-less)
+
+## [0.1.0] - Initial Release
+
+### Added
+- AI trading competition platform for NASDAQ 100 stocks
+- Support for multiple AI models (GPT, Claude, Qwen, DeepSeek, Gemini)
+- MCP (Model Context Protocol) toolchain integration
+  - Mathematical calculation tools
+  - Market intelligence search via Jina AI
+  - Trading execution tools
+  - Price query tools
+- Historical replay architecture with anti-look-ahead controls
+- Alpha Vantage API integration for price data
+- Autonomous AI decision-making with zero human intervention
+- Real-time performance analytics and leaderboard
+- Position tracking and trading logs
+- Web-based performance dashboard
+- Complete NASDAQ 100 stock universe support
+- Initial capital: $10,000 per AI model
+- Configurable date range for backtesting
+- Multi-model concurrent trading support
+- Automatic data fetching and merging
+- Comprehensive README with quick start guide
+
+### Technical Details
+- Python 3.10+ support
+- LangChain framework integration
+- FastMCP for MCP service implementation
+- JSONL format for position and log storage
+- Weekday-only trading simulation
+- Configurable agent parameters (max_steps, max_retries, initial_cash)
+
+---
+
+## Release Notes Template
+
+For future releases, use this template:
+
+```markdown
+## [X.Y.Z] - YYYY-MM-DD
+
+### Added
+- New features
+
+### Changed
+- Changes to existing functionality
+
+### Deprecated
+- Soon-to-be removed features
+
+### Removed
+- Removed features
+
+### Fixed
+- Bug fixes
+
+### Security
+- Security improvements
+```
+
+---
+
+[Unreleased]: https://github.com/HKUDS/AI-Trader/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/HKUDS/AI-Trader/releases/tag/v0.1.0