chore: add CITATION.cff (Citation File Format 1.2.0)

Author: KooshaPari

CITATION.cff

@@ -0,0 +1,9 @@
+cff-version: 1.2.0
+message: "If you use this software, please cite it as below."
+authors:
+  - family-names: Paridehpour
+    given-names: Koosha
+    orcid: "https://orcid.org/0000-0000-0000-0000"
+title: "helios-cli"
+url: "https://github.com/KooshaPari/helios-cli"
+license: Apache-2.0