docs: add changelog with project history

CHANGELOG.md

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+# Changelog
+
+All notable changes to Zemit are documented here.
+
+## [Unreleased]
+
+### Added
+- Claude Code CLI provider (local, no API key required)
+
+### Fixed
+- File deletions were not detected when generating commit messages (`--diff-filter=d` excluded deleted files)
+
+---
+
+## [1.1.4] - 2026-04-24
+
+### Changed
+- Improved prompt structure: diff is now accompanied by a `--name-status` summary of changed files
+- Updated README description and settings table to reflect new prompt version
+- Updated extension icon and banner image
+
+---
+
+## [1.1.3] - 2026-04-15
+
+### Changed
+- Refactored prompt system into a dedicated `prompts` module with enhanced commit instructions
+- Updated app icon and git banner images
+
+---
+
+## [1.1.2] - 2026-04-15
+
+### Changed
+- Updated extension icon
+- Shortened marketplace description
+
+---
+
+## [1.1.1] - 2026-04-15
+
+### Changed
+- Translated all UI messages to French
+- Updated default model to `claude-sonnet-4-6`
+
+---
+
+## [1.1.0] - 2026-04-15
+
+### Added
+- Dedicated `providers` module to support multiple AI backends
+- Dedicated `git` module for staged/unstaged diff handling
+- VS Code extension entry point with model selection
+
+### Changed
+- Refined conventional commit prompt to limit body usage
+- Extracted commit generation logic into its own module
+
+---
+
+## [1.0.0] - 2026-04-15
+
+### Added
+- Initial release of Zemit
+- AI-powered commit message generation using the Anthropic Claude API
+- Support for staged and unstaged git diffs
+- Conventional commit format by default
+- GNU General Public License v3.0