Adding a citation

CITATION.cff

@@ -0,0 +1,16 @@
+cff-version: 1.2.0
+message: "If you use build123d in your research, please cite it using the following information."
+title: "build123d: A Python-based parametric CAD library"
+version: "0.9.1"
+doi: "10.5281/zenodo.14872323"
+authors:
+  - name: "Roger Maitland"
+    affiliation: "Independent Developer"
+date-released: "2024-02-14"
+repository-code: "https://github.com/gumyr/build123d"
+license: "Apache-2.0"
+keywords:
+  - CAD
+  - Python
+  - OpenCascade
+  - Parametric Design

Citation.md

@@ -0,0 +1,19 @@
+# Citation
+
+If you use **build123d** in your research, please cite:
+
+Roger Maitland. **"build123d: A Python-based parametric CAD library"**. Version 0.9.1, 2025.  
+DOI: [10.5281/zenodo.14872323](https://doi.org/10.5281/zenodo.14872323)  
+Source Code: [GitHub](https://github.com/gumyr/build123d)
+
+## BibTeX Entry
+
+```bibtex
+@software{build123d,
+  author = {Roger Maitland},
+  title = {build123d: A Python-based parametric CAD library},
+  year = {2025},
+  version = {0.9.1},
+  doi = {10.5281/zenodo.14872323},
+  url = {https://github.com/gumyr/build123d}
+}

README.md

@@ -16,6 +16,8 @@
 [![Downloads](https://pepy.tech/badge/build123d)](https://pepy.tech/project/build123d)
 [![Downloads/month](https://pepy.tech/badge/build123d/month)](https://pepy.tech/project/build123d)
 [![PyPI - Wheel](https://img.shields.io/pypi/wheel/build123d.svg)](https://pypi.org/project/build123d/)
+[![DOI](https://zenodo.org/badge/510925389.svg)](https://doi.org/10.5281/zenodo.14872322)
+
 
 Build123d is a python-based, parametric, [boundary representation (BREP)][BREP] modeling framework for 2D and 3D CAD. It's built on the [Open Cascade] geometric kernel and allows for the creation of complex models using a simple and intuitive python syntax. Build123d can be used to create models for 3D printing, CNC machining, laser cutting, and other manufacturing processes.  Models can be exported to a wide variety of popular CAD tools such as [FreeCAD] and SolidWorks.
 

pyproject.toml

@@ -51,6 +51,7 @@ dependencies = [
 "Homepage" = "https://github.com/gumyr/build123d"
 "Documentation" = "https://build123d.readthedocs.io/en/latest/index.html"
 "Bug Tracker" = "https://github.com/gumyr/build123d/issues"
+"Citation" = "https://doi.org/10.5281/zenodo.14872323"
 
 [project.optional-dependencies]
 # enable the optional ocp_vscode visualization package