Added 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][keepachangelog] and adheres to [Semantic Versioning][semver].
+
+## [Unreleased]
+
+### Added
+- Added Changelog.md file
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [0.43.3] - 2025-09-15
+
+### Added
+- User authentication module with OAuth2 support.
+
+### Changed
+- Make file version to 0.43.2
+
+### Deprecated
+
+### Removed
+- Removed cli, network-cli binaries from project
+- Removed AI_CONTEXT.md
+- Removed Network.md
+- Removed unused log from monitoring.go
+
+### Fixed
+- Resolved race condition when saving settings.
+
+### Security
+
+_Initial release._
+
+[keepachangelog]: https://keepachangelog.com/en/1.1.0/
+[semver]: https://semver.org/spec/v2.0.0.html