[522] added CHANGELOG, removed superfluous notebook files

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]
+
+### Added
+
+- something we've added, coming soon
+- something else we've added
+
+### Fixed
+
+- something we've fixed (#issue_number)
+- something else we've fixed (#issue_number)
+
+### Changed
+
+- something we've changed (#issue_number)
+
+### Removed
+
+## [2.0.0] - 2023-07-01
+
+### Added
+
+- GitHub Action workflow which performs unit testing on the four supported versions of Python (3.8, 3.9, 3.10, and 3.11)
+
+### Fixed
+
+- L-moments-related errors (#512)
+- Various cleanups and formatting indentations
+
+### Changed
+
+- Build and dependency management now using poetry instead of setuptools
+- Documentation around installation with examples (#521) 
+
+### Removed
+
+- Palmer indices
+- Numba integration
+
+[unreleased]: https://github.com/monocongo/climate_indices/compare/v2.0.0...HEAD
+[2.0.0]: https://github.com/monocongo/climate_indices/releases/tag/v2.0.0