docs: add CHANGELOG.md for version tracking

Author: cakmoel

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).
+
+---
+
+## [1.0.1] - 2026-04-09
+
+### Added
+- Standard visual identity (scriptlog mascot assets)
+
+### Changed
+- Updated DEVELOPER GUIDE documentation
+- Updated general documentation
+
+### Fixed
+- **Security**: Resolved all Dependabot-detected vulnerabilities
+- **Quality**: Removed unnecessary files from the codebase
+
+### Details
+This patch addresses security vulnerabilities detected by Dependabot and removes unnecessary files to improve codebase quality. It also includes documentation updates and adds standard visual identity assets.
+
+### Comparison
+- **Previous release**: v1.0.0
+- **Changes since v1.0.0**: 4 commits
+
+---
+
+## [1.0.0] - Initial Release
+
+### Added
+- Initial stable release of Scriptlog
+- Complete PHP library with modern architecture
+- Support for MVC, database, validation, encryption, and more