Merge pull request #1121 from sirocco-rt/jhmatthews-patch-2

Update README.md

README.md

@@ -3,6 +3,7 @@
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13969075.svg)](https://doi.org/10.5281/zenodo.13969075)
 [![C/C++ CI](https://github.com/sirocco-rt/sirocco/actions/workflows/build.yml/badge.svg)](https://github.com/sirocco-rt/sirocco/actions/workflows/build.yml)
 [![Documentation Status](https://readthedocs.org/projects/sirocco-rt/badge/?version=latest)](https://sirocco-rt.readthedocs.io/en/latest/?badge=latest)
+[![arXiv](https://img.shields.io/badge/arXiv-2410.19908-b31b1b.svg)](https://arxiv.org/abs/2410.19908)
 
 *Sirocco* (Simulating Ionization and Radiation in Outflows Created by Compact Objects) is a Monte Carlo radiative transfer code which uses the Sobolev approximation. The code was formerly known as Python and renamed in October 2024. It has been developed by Knox Long, Christian Knigge, Stuart Sim, Nick Higginbottom, James Matthews, Sam Manghamm Edward Parkinson, Mandy Hewitt and Nico Scepi. The code has been used for a variety of research projects invovling the winds of cataclysmic variables, young stellar objects, X-ray binaries and AGN.