chore: add 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]
+
+nothing as of yet
+
+
+## [1.1.0] - 2023-08-07
+
+### Added
+
+- Changelog
+- License
+
+### Changed
+
+- Output path of attachments, which are now contained in directories named 
+  after their containing page
+
+
+## [1.0.1] - 2023-08-07
+
+### Added
+
+- Sample manifest in README to give a better idea on the output
+
+
+## [1.0.0] - 2023-08-07
+
+### Added
+
+- initial release
+
+
+[unreleased]: https://bitbucket.org/victorykit/xconfluencebuilder/branch/master
+[1.1.0]: https://bitbucket.org/victorykit/xconfluencebuilder/src/v1.1.0/
+[1.0.1]: https://bitbucket.org/victorykit/xconfluencebuilder/src/v1.0.1/
+[1.0.0]: https://bitbucket.org/victorykit/xconfluencebuilder/src/v1.0.0/