add change log

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).
+
+## [2.0.0] - 2025-04-12
+
+### Added
+- Runtime argument validation using Zod
+- JSON Schema to Zod schema conversion
+- Improved error handling and formatting
+- TypeScript strict mode enabled
+- Buildable project structure with proper TypeScript configuration
+- Enhanced project documentation
+- Better support for OpenAPI request body handling
+- Support for multiple content types
+
+### Changed
+- Simplified transport layer to only support stdio transport
+- Removed support for WebSocket and HTTP transports
+- Updated to use @modelcontextprotocol/sdk v1.9.0
+- Improved CLI interface with better error messages
+- Enhanced type safety throughout the codebase
+- Better handling of path parameters and query strings
+- More robust OpenAPI schema processing
+
+### Fixed
+- Path parameter resolution in URLs
+- Content-Type header handling
+- Response processing for different content types
+- Schema validation error messages
+- Building and packaging issues
+
+## [1.0.0] - Initial Release
+
+### Added
+- Basic OpenAPI to MCP server generation
+- Support for GET, POST, PUT, DELETE methods
+- Basic error handling
+- Simple CLI interface
+- Basic TypeScript support