Update citation format

CITATION.cff

@@ -1,26 +1,37 @@
 cff-version: "1.2.0"
-message: "If you use this software, please cite it as below."
+title: "pofff: An open-source image-based history-matching framework for the FluidFlower benchmark study using OPM Flow"
 authors:
 - family-names: Landa-Marbán
   given-names: David
   orcid: "https://orcid.org/0000-0002-3343-1005"
-- family-names: Sandve
-  given-names: Tor Harald
-  orcid: "https://orcid.org/0000-0002-3267-8276"
-- family-names: Both
-  given-names: Jakub Wiktor
-  orcid: "https://orcid.org/0000-0001-6131-4976"
-- family-names: Nordbotten
-  given-names: Jan Martin
-  orcid: "https://orcid.org/0000-0003-1455-5704"
-- family-names: Gasda
-  given-names: Sarah Eileen
-  orcid: "https://orcid.org/0000-0002-2610-8322"
-title: "Performance of an open-source image-based history   
-  matching framework for CO2 storage"
-year: 2026
-doi: 10.1007/s11242-025-02275-0
-volume: 153
-isbn: 1573-1634
-number: 2
-journal: Transport in Porous Media
+contact:
+- family-names: Landa-Marbán
+  given-names: David
+  orcid: "https://orcid.org/0000-0002-3343-1005"
+message: If you use this software, please cite our article in the
+  Journal of Transport in Porous Media.
+preferred-citation:
+  authors:
+  - family-names: Landa-Marbán
+    given-names: David
+    orcid: "https://orcid.org/0000-0002-3343-1005"
+  - family-names: Sandve
+    given-names: Tor Harald
+    orcid: "https://orcid.org/0000-0002-3267-8276"
+  - family-names: Both
+    given-names: Jakub Wiktor
+    orcid: "https://orcid.org/0000-0001-6131-4976"
+  - family-names: Nordbotten
+    given-names: Jan Martin
+    orcid: "https://orcid.org/0000-0003-1455-5704"
+  - family-names: Gasda
+    given-names: Sarah Eileen
+    orcid: "https://orcid.org/0000-0002-2610-8322"
+  title: "Performance of an open-source image-based history   
+    matching framework for CO2 storage"
+  year: 2026
+  doi: 10.1007/s11242-025-02275-0
+  volume: 153
+  isbn: 1573-1634
+  number: 2
+  journal: Transport in Porous Media