chore(docs): add DOI badge

README.md

@@ -9,6 +9,7 @@
 [![Latest Release][pypi-version-badge]][pypi-version-url]
 [![Python version][pypi-python-version-badge]][pypi-version-url]
 [![Documentation][documentation-badge]][documentation-url]
+[![DOI][doi-badge]][doi-url]
 [![Codecov][codecov-badge]][codecov-url]
 
 </div>
@@ -120,5 +121,7 @@ pytest --benchmark-only
 [pypi-python-version-badge]: https://img.shields.io/pypi/pyversions/DiffeRT?color=orange
 [documentation-badge]: https://readthedocs.org/projects/differt/badge/?version=latest
 [documentation-url]: https://differt.readthedocs.io/latest/?badge=latest
+[doi-badge]: https://zenodo.org/badge/DOI/10.5281/zenodo.11386432.svg
+[doi-url]: https://doi.org/10.5281/zenodo.11386432
 [codecov-badge]: https://codecov.io/gh/jeertmans/DiffeRT/branch/main/graph/badge.svg?token=v63alnTWzu
 [codecov-url]: https://codecov.io/gh/jeertmans/DiffeRT