adding citation file

CITATION.cff

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+# This CITATION.cff file was generated with cffinit.
+# Visit https://bit.ly/cffinit to generate yours today!
+
+cff-version: 1.2.0
+title: CREMMA-MSS-18
+message: >-
+  If you use this dataset, please cite it using the metadata
+  from this file.
+type: dataset
+authors:
+  - given-names: Elsa
+    family-names: Van Kote
+  - given-names: Margaux
+    family-names: Faure
+  - given-names: Jade
+    family-names: Norindr
+  - given-names: Thibault
+    family-names: Clérice
+    orcid: 'https://orcid.org/0000-0003-1852-9204'
+  - given-names: Alix
+    family-names: Chagué
+    orcid: 'https://orcid.org/0000-0002-0136-4434'
+repository-code: 'https://github.com/HTR-United/CREMMA-MSS-18'
+keywords:
+  - Handwritten Text Recognition
+  - Dataset
+  - Ground Truth
+  - French
+  - Manuscripts
+license: CC-BY-4.0
+date-released: '2024-03-13'