Create CITATION.cff

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: "Kwiatkowski"
+  given-names: "Kris"
+  orcid: "https://orcid.org/0000-0003-2363-317X"
+title: "optee_eng"
+version: 1.0.0
+doi: 10.5281/zenodo.1234
+date-released: 2021-08-31
+url: "https://github.com/kriskwiatkowski/optee_eng"