Add tests

[jm-rivera]

This pull request introduces several improvements to project infrastructure and documentation, focusing on code quality automation, testing, and clearer changelog practices. The most important changes are the addition of pre-commit hooks for code consistency and safety, integration of automated testing into the release workflow, and a complete rewrite of the changelog to follow best practices. There are also updates to the documentation to reflect the current version and supported Python versions.

Automation and Quality Checks:

• Added a .pre-commit-config.yaml file configuring a comprehensive set of pre-commit hooks, including Python linting/formatting (Ruff), file quality checks, JSON/YAML validation, security checks, and a hook to run pytest before commits. This helps ensure code consistency, catch errors early, and prevent common mistakes from being committed.

Continuous Integration:

• Updated .github/workflows/release.yml to add a test job that runs the test suite on Python 3.11 using uv and pytest, and made the release job depend on successful test completion. This enforces that releases are only created if tests pass.

Documentation and Changelog:

• Rewrote CHANGELOG.md to follow the "Keep a Changelog" format and Semantic Versioning, providing a clear and comprehensive history of changes, additions, and fixes for each release.
• Updated README.md to display the current package version (2.3.0), clarify that Python 3.11+ is required, and improve the description of supported indicators and databases. [1] [2] [3]

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