Create CHANGELOG.md

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2023-09-10
+
+### Added
+- Initial release of the ICD-10 Data Collection Script
+- Fetch and save data for all ICD-10 codes from the WHO API
+- Configurable via command-line arguments or config file
+- Comprehensive error handling and logging
+- Resumable execution
+- README with usage instructions
+- MIT License