feat: add CITATION file for project citation

Author: mcanouil

CITATION.cff

@@ -0,0 +1,13 @@
+cff-version: 1.2.0
+title: "Invoice Extension for Quarto"
+message: "If you use this project, please cite it as below."
+type: software
+authors:
+  - family-names: "Canouil"
+    given-names: "Mickaël"
+    orcid: "https://orcid.org/0000-0002-3396-4549"
+repository-code: "https://github.com/mcanouil/quarto-invoice"
+url: "http://m.canouil.dev/quarto-invoice/"
+license: "MIT"
+date-released: "2025-02-16"
+version: 1.2.2

_extensions/invoice/_extension.yml

@@ -1,4 +1,4 @@
-title: Invoice (Typst)
+title: Invoice
 author: Mickaël Canouil
 version: 1.2.2
 quarto-required: ">=1.6.39"