Added CITATION.cff

Author: Halvani

CITATION.cff

@@ -0,0 +1,11 @@
+cff-version: 1.2.0
+message: "If you use this library, please cite it as below."
+authors:
+  - family-names: "Halvani"
+    given-names: "Oren"
+    orcid: "https://orcid.org/0000-0002-1460-9373"
+title: "TextUnitLib - A Python library that allows easy extraction of a variety of text units within texts."
+version: 0.0.1
+doi: https://zenodo.org/records/17653726
+date-released: 2025-19-11
+url: "https://github.com/Halvani/constituent-treelib"