add CITATION.cff

CITATION.cff

@@ -0,0 +1,68 @@
+cff-version: 1.2.0
+message: Please cite the following works when using this software.
+authors:
+  - family-names: Willighagen
+    given-names: Lars
+    website: https://github.com/larsgw
+  - family-names: Verborgh
+    given-names: Ruben
+    website: https://github.com/RubenVerborgh
+  - family-names: Willighagen
+    given-names: Egon
+    website: https://github.com/egonw
+  - family-names: Voß
+    given-names: Jakob
+    website: https://github.com/nichtich
+  - family-names: Shaw
+    given-names: Alex
+    website: https://github.com/Symbitic
+  - family-names: Wiernik
+    given-names: Brenton M.
+    website: https://github.com/bwiernik
+  - family-names: Stein
+    given-names: Gabriel
+    website: https://github.com/gabestein
+  - family-names: Riquelme
+    given-names: Juan
+    website: https://github.com/soulchainer
+  - name: anadrome
+    website: https://github.com/anadrome
+  - family-names: Čermák
+    given-names: Petr
+    website: https://github.com/me2d09
+date-released: 2021-05-11
+identifiers:
+  - type: url
+    value: https://github.com/citation-js/citation-js
+title: citation-js/citation-js
+url: https://github.com/citation-js/citation-js
+version: v0.5.1
+preferred-citation:
+  authors:
+    - family-names: Willighagen
+      given-names: Lars G.
+  doi: 10.7717/peerj-cs.214
+  identifiers:
+    - type: doi
+      value: 10.7717/peerj-cs.214
+    - type: url
+      value: http://dx.doi.org/10.7717/peerj-cs.214
+    - type: other
+      value: urn:issn:2376-5992
+  title: >-
+    Citation.js: a format-independent, modular bibliography tool for the
+    browser and command line
+  url: http://dx.doi.org/10.7717/peerj-cs.214
+  database: Crossref
+  date-published: 2019-08-12
+  year: 2019
+  month: 8
+  issn: 2376-5992
+  journal: PeerJ Computer Science
+  languages:
+    - en
+  publisher:
+    name: PeerJ
+  start: e214
+  type: article
+  volume: 5