Add author

Author: xylar

CITATION.cff

@@ -65,6 +65,9 @@ authors:
   - given-names: Andrew
     family-names: Nolan
     orcid: 'https://orcid.org/0000-0002-9785-0196'
+  - given-names: Courtney
+    family-names: Shafer
+    orcid: 'https://orcid.org/0009-0001-3651-2812'
   - family-names: Saenz
     given-names: Juan
   - given-names: Maciej
@@ -77,4 +80,4 @@ authors:
 repository-code: 'https://github.com/MPAS-Dev/MPAS-Tools'
 url: 'https://mpas-dev.github.io/MPAS-Tools/master/'
 version: 1.3.0
-date-released: '2025-08-15'
+date-released: '2025-08-15'