Add CITATION.cff for dataset citation metadata

CITATION.cff

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+cff-version: 1.2.0
+title: Edirom Edition Example
+message: >-
+  If you use this dataset, please cite it using the
+  metadata from this file.
+type: dataset
+authors:
+  - given-names: Benjamin W.
+    family-names: Bohl
+    orcid: https://orcid.org/0000-0001-7217-9167
+  - given-names: Daniel
+    family-names: Jettka
+    orcid: https://orcid.org/0000-0002-2375-2227
+  - given-names: Daniel
+    family-names: Röwenstrunk
+    orcid: https://orcid.org/0000-0001-6271-2095
+  - given-names: Kristin
+    family-names: Herold
+    orcid: https://orcid.org/0000-0003-2915-353X
+  - given-names: Tobias
+    family-names: Bachmann
+    orcid: https://orcid.org/0009-0003-9952-7899
+  - given-names: Dennis
+    family-names: Ried
+    orcid: https://orcid.org/ 0000-0001-5545-2088
+  - given-names: Irmlind
+    family-names: Capelle
+    orcid: https://orcid.org/0000-0001-8897-2880
+repository-code: https://github.com/Edirom/EditionExample
+commit: 1234
+abstract: >-
+  This example edition is to build a sample edition data set that can be installed in eXist-db alongside Edirom-Online. 
+  The data set is to provide two perspectives on Edirom Online: (1) A feature based perspective providing test 
+  respective sample data for single features available in Edirom-Online that can be used to: (a) test the 
+  implementation of certain features, (b) explore the steps necessary to provide a certain feature in the context of 
+  your edition's data; (2) A user or content based perspective illustrating the capabilities of Edirom-Online in an 
+  annotated manner.
+license: CC-BY-4.0
+version: v0.2
+date-released: 2026-01-21