Add JOSS paper to README and add CITATION.cff

CITATION.cff

@@ -0,0 +1,57 @@
+cff-version: "1.2.0"
+authors:
+- family-names: Kopriva
+  given-names: David A.
+  orcid: "https://orcid.org/0000-0002-8076-0856"
+- family-names: Winters
+  given-names: Andrew R.
+  orcid: "https://orcid.org/0000-0002-5902-1522"
+- family-names: Schlottke-Lakemper
+  given-names: Michael
+  orcid: "https://orcid.org/0000-0002-3195-2536"
+- family-names: Schoonover
+  given-names: Joseph A.
+  orcid: "https://orcid.org/0000-0001-5650-7095"
+- family-names: Ranocha
+  given-names: Hendrik
+  orcid: "https://orcid.org/0000-0002-3456-2277"
+contact:
+- family-names: Winters
+  given-names: Andrew R.
+  orcid: "https://orcid.org/0000-0002-5902-1522"
+doi: 10.5281/zenodo.14342391
+message: If you use this software, please cite our article in the
+  Journal of Open Source Software.
+preferred-citation:
+  authors:
+  - family-names: Kopriva
+    given-names: David A.
+    orcid: "https://orcid.org/0000-0002-8076-0856"
+  - family-names: Winters
+    given-names: Andrew R.
+    orcid: "https://orcid.org/0000-0002-5902-1522"
+  - family-names: Schlottke-Lakemper
+    given-names: Michael
+    orcid: "https://orcid.org/0000-0002-3195-2536"
+  - family-names: Schoonover
+    given-names: Joseph A.
+    orcid: "https://orcid.org/0000-0001-5650-7095"
+  - family-names: Ranocha
+    given-names: Hendrik
+    orcid: "https://orcid.org/0000-0002-3456-2277"
+  date-published: 2024-12-11
+  doi: 10.21105/joss.07476
+  issn: 2475-9066
+  issue: 104
+  journal: Journal of Open Source Software
+  publisher:
+    name: Open Journals
+  start: 7476
+  title: "HOHQMesh: An All Quadrilateral/Hexahedral Unstructured Mesh
+    Generator for High Order Elements"
+  type: article
+  url: "https://joss.theoj.org/papers/10.21105/joss.07476"
+  volume: 9
+title: "HOHQMesh: An All Quadrilateral/Hexahedral Unstructured Mesh
+  Generator for High Order Elements"
+

README.md

@@ -5,6 +5,7 @@
 [![Coveralls](https://coveralls.io/repos/github/trixi-framework/HOHQMesh/badge.svg?branch=main)](https://coveralls.io/github/trixi-framework/HOHQMesh?branch=main)
 [![Codecov](https://codecov.io/gh/trixi-framework/HOHQMesh/branch/main/graph/badge.svg)](https://codecov.io/gh/trixi-framework/HOHQMesh)
 [![License: MIT](https://img.shields.io/badge/License-MIT-success.svg)](https://opensource.org/licenses/MIT)
+[![JOSS](https://joss.theoj.org/papers/10.21105/joss.07476/status.svg)](https://doi.org/10.21105/joss.07476)
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13959058.svg)](https://doi.org/10.5281/zenodo.13959058)
 
 <p align="center">
@@ -180,9 +181,24 @@ the different formats of the resulting mesh files, and visualization instruction
 
 
 ## Referencing
-If you use HOHQMesh in your own research, please cite this repository as follows:
+If you use HOHQMesh in your own research, please cite the following article:
 ```bibtex
-@misc{kopriva2024hohqmesh,
+@article{kopriva2024hohqmesh:joss,
+  title={{HOHQM}esh: An All Quadrilateral/Hexahedral Unstructured Mesh Generator for High Order Elements},
+  author={David A. Kopriva and Andrew R. Winters and Michael Schlottke-Lakemper
+          and Joseph A. Schoonover and Hendrik Ranocha},
+  year={2024},
+  journal={Journal of Open Source Software},
+  doi={10.21105/joss.07476},
+  volume = {9},
+  number = {104},
+  pages = {7476},
+  publisher = {The Open Journal}
+}
+```
+In addition, you can also directly refer to this repository as
+```bibtex
+@misc{kopriva2024hohqmesh:repo,
   title={{HOHQM}esh: An All Quadrilateral/Hexahedral Unstructured Mesh Generator for High Order Elements},
   author={Kopriva, David A and Winters, Andrew R and Schlottke-Lakemper, Michael
           and Schoonover, Joseph A and Ranocha, Hendrik},