citation file added

CITATION.cff

+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: APqr
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Tim
+    family-names: De Coster
+    email: t.j.c.de_coster@lumc.nl
+    affiliation: LUMC
+    orcid: 'https://orcid.org/0000-0002-4942-9866'
+  - given-names: Balázs
+    family-names: Ördög
+    email: b.o.oerdoeg@lumc.nl
+    affiliation: LUMC
+    orcid: 'https://orcid.org/0000-0002-8971-3079'