Add CHANGELOG.md (#10)

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](http://keepachangelog.com/en/1.1.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [0.1.2]
+
+### Added
+
+* Add support for MF=7, MT=451 thermal scattering general info ([#1](https://github.com/paulromano/endf-python/pull/1))
+* Allow encoding to be specified when opening ENDF file ([#2](https://github.com/paulromano/endf-python/pull/2))
+* Add tests for cfloat_endf ([#8](https://github.com/paulromano/endf-python/pull/8))
+* Add Python 3.12 in CI ([#9](https://github.com/paulromano/endf-python/pull/9))
+
+### Fixed
+
+* Fix issue with C++ endf float converter ([#7](https://github.com/paulromano/endf-python/pull/7))
+
+## [0.1.1]
+
+### Fixed
+
+* Fixed GHA workflow for building sdist
+
+## [0.1.0]
+
+### Added
+
+* Initial release