updat the change log

Author: Wall-ee

CHANGELOG.md

@@ -0,0 +1,27 @@
+# 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/1.1.0/),
+and this project adheres to Semantic Versioning (https://semver.org/spec/v2.0.0.html).
+
+## [0.2.1] - 2025-08-08
+### Added
+- MCP service integration and multi-tool invocation support in the Homebrew_S2 HTTP API.
+
+### Changed
+- Declared official Python support: 3.10+ (tested on 3.10–3.12).
+- Docs: Updated localized READMEs (Chinese and Japanese).
+- Minor docs typos
+
+## [0.1.1] - 2025-07-21
+### Added
+- Real quantum hardware (Homebrew_S2) execution path and quantum task management system
+- Example `examples/simple_demo_1.py`
+### Changed
+- Docs: README hardware setup guidance
+### Fixed
+- Minor docs typos
+
+## [0.1.0] - 2025-01
+### Added
+- Initial preview release: circuit, compiler, backends, autodiff

README.md

@@ -263,6 +263,14 @@ print(g(theta))
 - **Community Contributors**: Open source development and testing
 
 
+## Changelog
+
+- See the full changelog:[`CHANGELOG.md`](./CHANGELOG.md)
+
+### Recent Updates（Summary）
+- v0.2.1 — Official Python 3.10+ support; updated Chinese and Japanese READMEs; Homebrew_S2 HTTP API and documentation updated for multi-tool invocation and MCP service integration.
+- v0.1.1 — Initial public release; support for real quantum hardware Homebrew_S2 integration; added cloud task management examples; improved multi-backend and automatic differentiation experience.
+- v0.1.0 — Internal preview; framework skeleton with basic circuit/compiler/backend modules.
 
 ## License
 TyxonQ is open source, released under the Apache License, Version 2.0.