docs: add initial changelog

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
+- Release engineering with semantic-release
+- Multi-platform Docker builds (amd64, arm64)
+- Docker Hub and GHCR publishing
+- Staging and nightly deployment workflows
+- Commitlint for conventional commits
+
+## [0.0.0] - 2026-02-20
+
+### Added
+- Initial CV application
+- React frontend with Tailwind CSS v4
+- Express.js backend with SQLite
+- Admin panel for CV editing
+- Password protection for admin
+- Docker Compose deployment