Add CITATION.cff file

CITATION.cff

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+cff-version: 1.2.0
+title: Numbat
+message: >-
+  If you use this software in scientific publications,
+  please consider citing it using the metadata from
+  this file.
+type: software
+authors:
+  - given-names: David
+    family-names: Peter
+    email: [email protected]
+    orcid: 'https://orcid.org/0000-0001-7950-9915'
+repository-code: 'https://github.com/sharkdp/numbat'
+abstract: >-
+  A statically typed programming language for scientific
+  computations with first class support for physical
+  dimensions and units.
+license: MIT
+version: 1.14.0
+date-released: '2024-10-11'