Create CITATION.cff

Author: MilesCranmer

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software, please cite it using as below."
+authors:
+- family-names: "Cranmer"
+  given-names: "Miles"
+  orcid: "https://orcid.org/0000-0002-6458-3423"
+title: "Interpretable Machine Learning for Science with PySR & SymbolicRegression.jl"
+version: 1.0.0
+date-released: 2023-05-02
+doi: 10.48550/arXiv.2305.01582
+url: "https://github.com/MilesCranmer/pysr_paper"