Add contributor to citations (#7)

Author: hsaunders1904

CITATION.cff

@@ -4,6 +4,10 @@ authors:
     given-names: J. E.
     affiliation: United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
 
+  - family-names: Panayis
+    given-names: J.
+    affiliation: United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom
+
   - family-names: Saunders
     given-names: H.
     affiliation: United Kingdom Atomic Energy Authority, Culham Science Centre, Abingdon, Oxfordshire OX14 3DB, United Kingdom