Adding citation file

CITATION.cff

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+cff-version: 1.2.0
+title: >-
+  medigan: Synthetic Medical Data From Pretrained
+  Generative Models
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - given-names: Richard
+    family-names: Osuala
+    email: [email protected]
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0003-1835-8564'
+  - given-names: Noussair
+    family-names: Lazrak
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0002-7459-146X'
+  - given-names: Kaisar
+    family-names: Kushibar
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0001-7507-5208'
+  - given-names: Lidia
+    family-names: Garrucho
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0002-3105-2773'
+  - given-names: Socayna
+    family-names: Jouide
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0001-6809-8145'
+  - given-names: Oliver
+    family-names: Diaz
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0001-6789-5177'
+  - given-names: Karim
+    family-names: Lekadir
+    affiliation: University of Barcelona
+    orcid: 'https://orcid.org/0000-0002-9456-1612'
+version: 0.1
+doi: 10.5281/zenodo.6327624
+date-released: 2022-03-04