Add CHANGELOG for v1.0.0 release

Author: davidweb3-ctrl

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).
+
+## [1.0.0] - 2025-04-19
+
+### Added
+- Initial release of MCP Git Enhanced Server
+- `git_diff` tool - Analyze code changes between commits, branches, or working directory
+- `git_log` tool - Commit history analysis with filtering and statistics
+- `git_branch` tool - Branch management with list, compare, and cleanup suggestions
+- `git_status` tool - Comprehensive repository status overview
+- `git_commit_analyze` tool - Detailed single commit inspection
+- Full TypeScript support with strict mode
+- MCP SDK integration
+- Claude Code configuration example
+- GitHub Actions CI workflow
+- MIT License
+- Comprehensive documentation and examples
+
+[1.0.0]: https://github.com/davidweb3-ctrl/mcp-git-enhanced/releases/tag/v1.0.0