Add changelog

Author: mdales

CHANGES.md

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+## v1.1.0 (4/11/2025)
+
+### Added
+
+* Implementation of point validation based on [Dahal et al](https://gmd.copernicus.org/articles/15/5093/2022/).
+
+### Changed
+
+* Performance improvements and simplification to habitat processing.
+* Store more analysis data from model validation.
+
+## v1.0.1 (19/10/2025)
+
+### Fixed
+
+* Fixed github action for publishing to pip.
+
+## v1.0.0 (19/10/2025)
+
+### Added
+
+* Initial release as stand alone package.