Add CHANGELOG

CHANGELOG

+# FACT Employment Official Statistics Changelog
+All notable changes to this project will be documented in this file.
+Release mentioned here correspond to docker registry entries and use semantic versioning as in 'MAJOR.MINOR.PATCH'.
+## Change entries
+Added: For new features that have been added.
+Changed: For changes in existing functionality.
+Deprecated: For once-stable features removed in upcoming releases.
+Removed: For features removed in this release.
+Fixed: For any bug fixes.
+Security: For vulnerabilities.
+
+## [0.2.0] - ongoing
+Added:
+- license
+- changelog
+- contributing
+Changed
+- added xxx BLS datasets
+- added xxx EUROSTAT datasets
+Fixed
+- database tables partitioning on extended state/country ISO3 codes
+
+## [0.1.0] - 2023-10-19
+Added:
+- first full structure and dataset creation
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