Create CITATION.cff (which makes GitHub display a "Cite this repo" button in the "About" panel)

CITATION.cff

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+cff-version: 1.2.0
+title: "GDL - GNU Data Language"
+url: "https://github.com/gnudatalanguage/gdl"
+preferred-citation:
+  type: article
+  authors:
+  - family-names: "Park"
+    given-names: "Jeongbin"
+    orcid: "https://orcid.org/0000-0002-9064-4912"
+  - family-names: "Duvert"
+    given-names: "Gilles"
+    orcid: "https://orcid.org/0000-0001-8769-3660"
+  - family-names: "Coulais"
+    given-names: "Alain"
+    orcid: "https://orcid.org/0000-0001-6492-7719"
+  - family-names: "Jung"
+    given-names: "Gregory V."
+  - family-names: "Arabas"
+    given-names: "Sylwester"
+    orcid: "https://orcid.org/0000-0003-2361-0082"
+  - family-names: "Barker"
+    given-names: "Brian"
+  - family-names: "Enomoto"
+    given-names: "Takeshi"
+  - family-names: "Flinois"
+    given-names: "Sylvain"
+  - family-names: "Gressel"
+    given-names: "Oliver"
+  - family-names: "Hillberg"
+    given-names: "Tomas"
+  - family-names: "Huillet"
+    given-names: "Thibault"
+  - family-names: "Kohnert"
+    given-names: "Jan"
+  - family-names: "Poplawski"
+    given-names: "Orion"
+  - family-names: "Rozier de Linage"
+    given-names: "Eloi"
+  - family-names: "Solås"
+    given-names: "Remi A."
+  - family-names: "Stagner"
+    given-names: "Luke"
+  - family-names: "Streicher"
+    given-names: "Ole"
+    orcid: "https://orcid.org/0000-0001-7751-1843"
+  - family-names: "Tappin"
+    given-names: "James"
+  - family-names: "Thomas"
+    given-names: "Thierry"
+  - family-names: "Wang"
+    given-names: "Jingwei"
+  - family-names: "Wimmer"
+    given-names: "Christian"
+  doi: "10.21105/joss.04633"
+  journal: "JOSS"
+  title: "GNU Data Language 1.0: a free/libre and open-source drop-in replacement for IDL/PV-WAVE"
+  year: 2022