Add citation file

CITATION.cff

@@ -1,13 +1,22 @@
-cff-version: 1.2.0
-message: "If you use this software, please cite it as below."
+title: TUM ESM Python Utilities
+abstract: Python utilities for our research group and beyond
 authors:
-  - family-names: Makowski
+  - affiliation: Technical University of Munich
+    family-names: Makowski
     given-names: Moritz
-    orcid: https://orcid.org/0000-0002-2948-2993
-  - family-names: Klappenbach
+    orcid: 0000-0002-2948-2993
+  - affiliation: Technical University of Munich
+    family-names: Klappenbach
     given-names: Friedrich
-    orcid: https://orcid.org/0000-0001-9455-6496
-title: "TUM ESM Python Utilities"
-license: "GPL-3.0-or-later"
+    orcid: 0000-0001-9455-6496
+  - affiliation: Technical University of Munich
+    family-names: Chen
+    given-names: Jia
+    orcid: 0000-0002-6350-6610
+cff-version: 1.2.0
+doi: 10.5281/zenodo.14284949
+license:
+  - gpl-3.0-or-later
+type: software
 version: 2.5.0
-date-released: 2024-12-05
+date-released: "2024-12-05"