Update README.md with paper

README.md

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 # Emiproc
 
+[![DOI](https://joss.theoj.org/papers/10.21105/joss.07509/status.svg)](https://doi.org/10.21105/joss.07509)
+[![ReadTheDocs](https://readthedocs.org/projects/emiproc/badge/?version=master)](emiproc.readthedocs.io)
+
+
 Python package for processing emission datasets and converting them
 into netcdf rasters or inputs for transport models (ICON-ART, COSMO-ART, ...).
 
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 ## License
 
 This work is licensed under a BSD-3-Clause licence. See the LICENSE file for details or https://opensource.org/license/bsd-3-clause
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+
+## References 
+
+If you use emiproc, please cite our paper: [https://doi.org/10.21105/joss.07509](https://doi.org/10.21105/joss.07509)
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+