add CITATION.cff

CITATION.cff

@@ -0,0 +1,20 @@
+# YAML 1.2
+# Metadata for citation of this software according to the CFF format (https://citation-file-format.github.io/)
+cff-version: 1.0.3
+message: If you use this software, please cite it using these metadata.
+title: 'Hashinator: A hybrid hashmap designed for heterogeneous computing.'
+doi: 10.5281/zenodo.11396297
+authors:
+- given-names: Kostis
+ family-names: Papadakis
+ affiliation: University of Helsinki
+- given-names: Markus
+ family-names: Battarbee
+ affiliation: University of Helsinki
+- given-names: René
+ family-names: Widera
+ affiliation:
+version: 1.0.1
+date-released: 2024-05-30
+repository-code: https://github.com/fmihpc/hashinator
+license: cc-by-4.0