Add citation info

.reuse/dep5

@@ -31,6 +31,9 @@ Files: AUTHORS.md
 Copyright: 2024 OGL authors
 License: GPL-3.0-or-later
 
+Files: CITATION.cff
+Copyright: 2024 OGL authors
+License: GPL-3.0-or-later
 # Sample paragraph, commented out:
 #
 # Files: src/*

CITATION.cff

@@ -0,0 +1,31 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - family-names: "Olenik"
+    given-names: "Gregor"
+  - family-names: "Koch"
+    given-names: "Marcel"
+  - family-names: "Boutanios"
+    given-names: "Ziad"
+  - family-names: "Anzt"
+    given-names: "Hartwig" 
+title: "The OpenFOAM Ginkgo Layer (OGL)"
+version: 0.5.3
+date-released: 2024-03-08
+url: "https://github.com/hpsim/OGL"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Olenik"
+    given-names: "Gregor"
+  - family-names: "Koch"
+    given-names: "Marcel"
+  - family-names: "Boutanios"
+    given-names: "Ziad"
+  - family-names: "Anzt"
+    given-names: "Hartwig" 
+  doi: "10.1007/s11012-024-01806-1"
+  journal: " Meccanica"
+  month: 6
+  title: "Towards a platform‑portable linear algebra backend for OpenFOAM"
+  year: 2024

README.md

@@ -143,6 +143,19 @@ title = {{Ginkgo: A Modern Linear Operator Algebra Framework for High Performanc
 volume = {48},
 year = {2022}
 }
+
+@Article{Olenik2024,
+author={Olenik, Gregor and Koch, Marcel and Boutanios, Ziad and Anzt, Hartwig},
+title={Towards a platform-portable linear algebra backend for OpenFOAM},
+journal={Meccanica},
+year={2024},
+month={Jun},
+day={12},
+issn={1572-9648},
+doi={10.1007/s11012-024-01806-1},
+url={https://doi.org/10.1007/s11012-024-01806-1}
+}
+
 ```
 
 ## Example