Create CITATION.cff

Author: JeffreySarnoff

CITATION.cff

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+cff-version: 1.2.0
+message: If you use this software, please cite it using these metadata.
+title: AngleBetweenVectors
+abstract: Compute the arc separating two cartesian vectors in a stable and robust manner.
+authors:
+  - given-names: Jeffrey
+    family-names: Sarnoff
+    email: "[email protected]"
+    affiliation: "Julia Innovator"
+type: software
+url: "https://github.com/JeffreySarnoff/AngleBetweenVectors.jl"
+repository-code: "https://github.com/JeffreySarnoff/AngleBetweenVectors.jl"
+version: 0.3.1
+date-released: 2022-06-25
+license: MIT