Add cff for ifccityjson

src/ifccityjson/CITATION.cff

@@ -0,0 +1,18 @@
+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: ifccityjson
+message: >-
+  If you use this software, please cite it using the
+  metadata from this file.
+type: software
+authors:
+  - name: IfcOpenShell contributors
+repository-code: >-
+  https://github.com/IfcOpenShell/IfcOpenShell/tree/v0.7.0/src/ifccityjson
+abstract: Convert CityJSON to IFC
+keywords:
+  - CityJSON
+  - IFC
+license: LGPL-3.0-or-later