Add CHANGELOG and update to v0.2.0

CHANGELOG.md

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+# Clinical-Genomics-Lund/jasentool: 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).
+
+## [v0.2.0]
+
+### Added
+
+ - Added tb validation notebook
+ - Added output csv for failed validation samples
+ - Added differential matrix for validation
+ - Added saureus validation notebook
+ - Added `--generate_matrix` argument to cli
+ - Added `alter_sample_id` filter
+ - Added summed differential matrix
+ - Added mean coverage plot
+ - Added jitter to mean coverage boxplot
+
+### Fixed
+
+ - Fixed `pyproject.toml` setuptools bug
+ - Fixed cgmlst comparison and plots
+ - Fixed `fix` subarg
+ - Fixed TN/TP/FN/FP plots
+
+### Changed
+
+ - Changed id format for fix and missing
+ - Changed matrix to boxplot, jitter, and annotate