Create CITATION.cff (#120)

* Create CITATION.cff

* Update README.md

* Update README.md

Author: jan-janssen

CITATION.cff

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+cff-version: "1.2.0"
+authors:
+- family-names: Janssen
+  given-names: Jan
+  orcid: "https://orcid.org/0000-0001-9948-7119"
+- family-names: George
+  given-names: Janine
+  orcid: "https://orcid.org/0000-0001-8907-0336"
+- family-names: Geiger
+  given-names: Julian
+  orcid: "https://orcid.org/0000-0003-0023-1960"
+- family-names: Bercx
+  given-names: Marnik
+  orcid: "https://orcid.org/0000-0001-8470-1012"
+- family-names: Wang
+  given-names: Xing
+- family-names: Ertural
+  given-names: Christina
+  orcid: "https://orcid.org/0000-0002-7696-5824"
+- family-names: Schaarschmidt
+  given-names: Joerg
+  orcid: "https://orcid.org/0000-0002-4389-2366"
+- family-names: Ganose
+  given-names: Alex
+  orcid: "https://orcid.org/0000-0002-4486-3321"
+- family-names: Pizzi
+  given-names: Giovanni
+  orcid: "https://orcid.org/0000-0002-3583-4377"
+- family-names: Hickel
+  given-names: Tilmann
+  orcid: "https://orcid.org/0000-0003-0698-4891"
+- family-names: Neugebauer
+  given-names: Joerg
+  orcid: "https://orcid.org/0000-0002-7903-2472"
+title: "A Python workflow definition for computational materials design"
+version: 0.1.1
+doi: 10.5281/zenodo.15516180
+date-released: 2025-05-26
+license: bsd-3-clause
+url: "https://github.com/pythonworkflow/python-workflow-definition"

README.md

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 # Python Workflow Definition
 [![Pipeline](https://github.com/pythonworkflow/python-workflow-definition/actions/workflows/pipeline.yml/badge.svg)](https://github.com/pythonworkflow/python-workflow-definition/actions/workflows/pipeline.yml)
 [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/pythonworkflow/python-workflow-definition/HEAD)
+[![arXiv](https://img.shields.io/badge/arXiv-2505.20366-b31b1b.svg)](https://arxiv.org/abs/2505.20366)
+[![DOI](https://zenodo.org/badge/945869529.svg)](https://doi.org/10.5281/zenodo.15516179)
 
 ## Definition
 In the Python Workflow Definition (PWD) each node represents a Python function, with the edges defining the connection