Create CITATION.cff

Author: rabernat

CITATION.cff

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+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - given-names: Chiara
+    family-names: Lepore
+    orcid: https://orcid.org/0000-0002-1606-6982
+  - given-names: John
+    family-names: Allen
+    orcid: https://orcid.org/0000-0002-2036-0666
+  - given-names: Ryan
+    family-names: Abernathey
+    orcid: https://orcid.org/0000-0001-5999-4917
+title: xcape
+abstract: Fast convective parameters for Numpy, Dask, and Xarray
+version: v0.1.4
+date-released: 2021-07-26
+license: MIT
+repository-code: "https://github.com/xgcm/xcape"