Add missing names in CITATION.cff

CITATION.cff needs names to be set to be working properly.
As we do not have all names, "Anonymous Developer"
is used as a placeholder.

CITATION.cff

@@ -103,42 +103,60 @@ authors:
     given-names: Bryan
     alias: "@bmlancien"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@nesnoj"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@lmilletb"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@mloenneberga"
   -
     family-names: "Schürmann"
     given-names: Lennart
     alias: "@lensum"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@RD-OTH"
   -
     family-names: Delfs
     given-names: Jens-Olaf
     alias: "@drjod"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@stefansc1"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@escalacjo"
   -
     family-names: Smalla
     given-names: Tjark
     alias: "@ChillkroeteTTS"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@ajimenezUCLA"
   -
     family-names: Wolf
     given-names: Jakob
     alias: "@jakob-wo"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@elisapap"
   -
     family-names: Gaudchau
     given-names: Elisa
     alias: "@elisagaudchau"
   -
+    family-names: Developer
+    given-names: Anonymous
     alias: "@chrisflei"
   -
     family-names: Rohrer