Create CITATION.cff

Author: fandreuz

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+- family-names: "Tezzele"
+  given-names: "Marco"
+  orcid: "https://orcid.org/0000-0001-9747-6328"
+- family-names: "Demo"
+  given-names: "Nicola"
+  orcid: "https://orcid.org/0000-0003-3107-9738"
+- family-names: "Mola"
+  given-names: "Andrea"
+  orcid: "https://orcid.org/0000-0002-4483-0212"
+- family-names: "Rozza"
+  given-names: "Gianluigi"
+  orcid: "https://orcid.org/0000-0002-0810-8812"
+title: "PyGeM: Python Geometrical Morphing"
+version: 2.0.3
+doi: 10.1016/j.simpa.2020.100047
+date-released: 2021-02-01
+url: "https://github.com/mathLab/PyGeM"