Add initial CITATION.cff file (#61)

CITATION.cff

@@ -0,0 +1,28 @@
+cff-version: 1.2.0
+title: GeoCAT-applications
+message: >-
+  If you use this resource, please cite it using the
+  metadata from this file.
+authors:
+  - given-names: Katelyn
+    family-names: FitzGerald
+    affiliation: NSF NCAR
+    orcid: 'https://orcid.org/0000-0003-4184-1917'
+  - given-names: Julia
+    family-names: Kent
+    affiliation: NSF NCAR
+    orcid: 'https://orcid.org/0000-0002-5611-8986'
+  - given-names: Andy
+    family-names: McKeen
+    affiliation: 'Vermont State University, NSF NCAR'
+    orcid: 'https://orcid.org/0009-0005-2551-8118'
+  - given-names: Cora
+    family-names: Schneck
+    affiliation: NSF NCAR
+    orcid: 'https://orcid.org/0009-0009-1415-5170'
+  - given-names: Anissa
+    family-names: Zacharias
+    affiliation: NSF NCAR
+    orcid: 'https://orcid.org/0000-0002-2666-8493'
+repository-code: 'https://github.com/NCAR/geocat-applications'
+url: 'https://ncar.github.io/geocat-applications/'