docs: update project document

CHANGELOG.md

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+# Changelog
+
+All notable changes to this 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
+- Bilingual README (English and Simplified Chinese)
+- Project Logo
+- GitHub Issue Templates (Bug Report and Feature Request)
+- Code of Conduct
+- Star History chart in README
+- Detailed FAQ section in README
+- Technical stack and project structure documentation
+
+## [0.0.1] - 2025-12-22
+
+### Added
+- Initial release of Antigravity Manager
+- Multi-account management for Google Gemini and Claude
+- Real-time quota monitoring
+- Intelligent auto-switching capabilities
+- Secure credential storage (AES-256-GCM)
+- IDE synchronization
+- Dark mode support
+- System tray integration