docs: add arxiv lozenge (#1030)

README.md

@@ -13,6 +13,7 @@
 [![Tests/Windows](https://github.com/NVIDIA/garak/actions/workflows/test_windows.yml/badge.svg)](https://github.com/NVIDIA/garak/actions/workflows/test_windows.yml)
 [![Tests/OSX](https://github.com/NVIDIA/garak/actions/workflows/test_macos.yml/badge.svg)](https://github.com/NVIDIA/garak/actions/workflows/test_macos.yml)
 [![Documentation Status](https://readthedocs.org/projects/garak/badge/?version=latest)](http://garak.readthedocs.io/en/latest/?badge=latest)
+[![arXiv](https://img.shields.io/badge/cs.CL-arXiv%3A2406.11036-b31b1b.svg)](https://arxiv.org/abs/2406.11036)
 [![discord-img](https://img.shields.io/badge/chat-on%20discord-yellow.svg)](https://discord.gg/uVch4puUCs)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/garak)](https://pypi.org/project/garak)