add joss badge

README.md

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-![Python package](https://github.com/copasi/basico/workflows/Python%20package/badge.svg) [![Documentation Status](https://readthedocs.org/projects/basico/badge/?version=latest)](https://basico.readthedocs.io/en/latest/?badge=latest) [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=copasi_basico&metric=alert_status)](https://sonarcloud.io/dashboard?id=copasi_basico) [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/copasi/basico.git/HEAD?filepath=docs/notebooks/index.ipynb) [![DOI](https://zenodo.org/badge/148472105.svg)](https://zenodo.org/badge/latestdoi/148472105) [![codecov](https://codecov.io/gh/copasi/basico/branch/master/graph/badge.svg?token=MG54YU29JQ)](https://codecov.io/gh/copasi/basico)
+![Python package](https://github.com/copasi/basico/workflows/Python%20package/badge.svg) [![Documentation Status](https://readthedocs.org/projects/basico/badge/?version=latest)](https://basico.readthedocs.io/en/latest/?badge=latest) [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=copasi_basico&metric=alert_status)](https://sonarcloud.io/dashboard?id=copasi_basico) [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/copasi/basico.git/HEAD?filepath=docs/notebooks/index.ipynb) [![DOI](https://zenodo.org/badge/148472105.svg)](https://zenodo.org/badge/latestdoi/148472105) [![codecov](https://codecov.io/gh/copasi/basico/branch/master/graph/badge.svg?token=MG54YU29JQ)](https://codecov.io/gh/copasi/basico) [![DOI](https://joss.theoj.org/papers/10.21105/joss.05553/status.svg)](https://doi.org/10.21105/joss.05553)
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 ## BasiCO
 This project hosts a simplified python interface to COPASI. While all functionality from COPASI