Add CITATION.cff for scientific paper citation

[Copilot]

Adds a Citation File Format (CFF) file to enable proper software citation in scientific papers.

Changes

• Created CITATION.cff with:
  • Author: Nikolay Donets (ORCID: 0009-0008-2912-6615)
  • DOI: 10.5281/zenodo.17727790
  • Version/date pulled from latest release (2.0.0, 2025-07-04)

GitHub will automatically render citation info in the repository sidebar.

Original prompt

Create a file CITATION.cff and add there info so the software can be refered in the scientific papers.

My orcid: https://orcid.org/0009-0008-2912-6615
family-names: "Donets"
given-names: "Nikolay"
doi: https://doi.org/10.5281/zenodo.17727790

For the release date use info from the repo

Use this as example:

cff-version: 1.2.0
message: "If you use this software, please cite it as below."
authors:
  - family-names: "xxx"
    given-names: "xxx"
    orcid: "https://orcid.org/0000-000X-XXXX-XXXX"
title: "XXXX"
version: X.XX.XX
doi: 10.XXXX/zenodo.XXXXX
date-released: XXXX-XX-XX
url: "https://github.com/nikdon/pyEntropy"

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