Create README.md

Author: Francesca Capel

README.md

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+# Bayesian constraints on the astrophysical neutrino population from IceCube data
+
+Code used in [arXiv:2005.02395](https://arxiv.org/abs/2005.02395). The directories here are organised to follow the paper and 
+each section is documented with jupyter notebooks. 
+
+If you use this code in your work please cite the above paper.
+
+## Dependencies
+
+* [icecube_tools](https://github.com/cescalara/icecube_tools) - for simulation of neutrino detection in IceCube using public info
+* [Stan](https://mc-stan.org) and [PyStan](https://pystan.readthedocs.io/en/latest/) - to fit the hierarchical model 
+
+## Questions?
+
+If you have any questions feel free to open an issue or get in touch ([email protected]).