Add CHANGELOG.md with project versioning history

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Fixed
+
+- Remove redundant topic name extraction from tests
+- Improve JATS list tag conversion with sequential processing to handle ordered and unordered lists more robustly
+- Standardize package imports and configure explicit exports
+
+## [v2.0.2] - 2025-07-10
+
+### Added
+
+- Documentation infrastructure with Sphinx and RTD theme
+- Multiversion documentation support
+- Demo animated webp image to README
+- Documentation website link in README
+
+### Changed
+
+- Migrated to pyproject.toml for modern project configuration
+- Moved demo image from assets to docs directory
+- Updated documentation build process for multiversion support
+- Improved documentation structure and content
+
+### Fixed
+
+- Updated AbstractProcessor to accept optional console parameter
+- Removed unused datetime import and simplified super() call
+
+### Security
+
+- Configured Secret Detection in GitLab CI
+
+## [v2.0.1] - 2025-07-08
+
+### Added
+
+- GitLab CI integration with test reporting
+- Updated badges in README.md
+
+### Changed
+
+- Migrated from Forgejo to GitLab CI for continuous integration
+
+## [v2.0.0] - 2025-07-07
+
+### Changed
+
+- **BREAKING CHANGE**: Generalized script by removing organizational metadata
+- Updated version number in README
+- Removed duplicate heading in README
+
+### Fixed
+
+- Fixed README formatting issues
+
+## [v1.1] - 2025-07-04
+
+### Added
+
+- Support for ROR (Research Organization Registry) institution identifiers in affiliations
+- Additional topic metadata fields for OpenAlex integration
+- Comprehensive docstrings to classes and methods
+- Code coverage configuration and expanded test suite
+- Information on flag for using ROR identifiers for institutions in README
+
+### Changed
+
+- Updated testing documentation and improved test structure
+
+### Fixed
+
+- Fixed license field being wrapped in tuple due to trailing comma
+- Fixed missing affiliation in Person class output
+- Fixed affiliation field name in Person class
+
+## [v1.0] - 2025-03-21
+
+### Added
+
+- Initial release of doi2dataset
+- DOI validation and normalization
+- Metadata retrieval from external APIs (OpenAlex and CrossRef)
+- Standard Dataverse metadata generation including:
+  - Title, publication date, and alternative URL
+  - Author information with affiliations and ORCID identifiers
+  - Dataset contact information (corresponding authors)
+  - Abstract and description
+  - Keywords and subject classification
+  - Grant/funding information
+  - License information when available
+- Optional upload functionality to Dataverse.org servers
+- Progress tracking with Rich library
+- Configuration management with YAML files
+- Command-line interface
+
+[Unreleased]: https://git.uni-due.de/cbm343e/doi2dataset/-/compare/v2.0.2...HEAD
+[v2.0.2]: https://git.uni-due.de/cbm343e/doi2dataset/-/compare/v2.0.1...v2.0.2
+[v2.0.1]: https://git.uni-due.de/cbm343e/doi2dataset/-/compare/v2.0...v2.0.1
+[v2.0.0]: https://git.uni-due.de/cbm343e/doi2dataset/-/compare/v1.1...v2.0
+[v1.1]: https://git.uni-due.de/cbm343e/doi2dataset/-/compare/v1.0...v1.1
+[v1.0]: https://git.uni-due.de/cbm343e/doi2dataset/-/tags/v1.0