fix yaml format by setting inddent

Author: mustafasoylu

CITATION.cff

@@ -9,27 +9,27 @@ url: https://materials-data-science-and-informatics.github.io/somesy
 repository-code: https://github.com/Materials-Data-Science-and-Informatics/somesy
 license: MIT
 keywords:
-- metadata
-- FAIR
+  - metadata
+  - FAIR
 authors:
-- orcid: https://orcid.org/0000-0003-2637-0432
-  email: m.soylu@fz-juelich.de
-  given-names: Mustafa
-  family-names: Soylu
-- email: a.pirogov@fz-juelich.de
-  orcid: https://orcid.org/0000-0002-5077-7497
-  family-names: Pirogov
-  given-names: Anton
-- email: v.hofmann@fz-juelich.de
-  orcid: https://orcid.org/0000-0002-5149-603X
-  family-names: Hofmann
-  given-names: Volker
-- email: s.sandfeld@fz-juelich.de
-  orcid: https://orcid.org/0000-0001-9560-4728
-  family-names: Sandfeld
-  given-names: Stefan
+  - orcid: https://orcid.org/0000-0003-2637-0432
+    email: m.soylu@fz-juelich.de
+    given-names: Mustafa
+    family-names: Soylu
+  - email: a.pirogov@fz-juelich.de
+    orcid: https://orcid.org/0000-0002-5077-7497
+    family-names: Pirogov
+    given-names: Anton
+  - email: v.hofmann@fz-juelich.de
+    orcid: https://orcid.org/0000-0002-5149-603X
+    family-names: Hofmann
+    given-names: Volker
+  - email: s.sandfeld@fz-juelich.de
+    orcid: https://orcid.org/0000-0001-9560-4728
+    family-names: Sandfeld
+    given-names: Stefan
 contact:
-- email: m.soylu@fz-juelich.de
-  family-names: Soylu
-  given-names: Mustafa
-  orcid: https://orcid.org/0000-0003-2637-0432
+  - email: m.soylu@fz-juelich.de
+    family-names: Soylu
+    given-names: Mustafa
+    orcid: https://orcid.org/0000-0003-2637-0432

src/somesy/cff/writer.py

@@ -26,6 +26,7 @@ def __init__(
         """
         self._yaml = YAML()
         self._yaml.preserve_quotes = True
+        self._yaml.indent(mapping=2, sequence=4, offset=2)
 
         mappings: FieldKeyMapping = {
             "name": ["title"],