Add CITATION.cff for software citation guidelines

Author: rscherrer

CITATION.cff

@@ -0,0 +1,13 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+
+authors:
+  - family-names: Scherrer
+    given-names: Raphaël
+    orcid: https://orcid.org/0000-0002-1447-7630
+
+title: "SimArray: Simulation folder generator"
+date-released: 2025-04-28
+
+repository-code: https://github.com/rscherrer/simarray
+license: MIT