Add DOI badge

Author: wmvanvliet

README.rst

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 Representational Similarity Analysis
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-|unit_tests| |build_docs|
+|unit_tests| |build_docs| |doi|
 
 .. |unit_tests| image:: https://github.com/wmvanvliet/mne-rsa/workflows/unit%20tests/badge.svg
    :target: https://github.com/wmvanvliet/mne-rsa/actions?query=workflow%3A%22unit+tests%22
 
 .. |build_docs| image:: https://github.com/wmvanvliet/mne-rsa/workflows/build-docs/badge.svg
    :target: https://github.com/wmvanvliet/mne-rsa/actions?query=workflow%3Abuild-docs
 
+.. |doi| image:: https://zenodo.org/badge/194268560.svg
+   :target: https://zenodo.org/doi/10.5281/zenodo.11242874
+
 This is a Python package for performing representational similarity
 analysis (RSA) using
 `MNE-Python <https://martinos.org/mne/stable/index.html>`__ data