Update README.md

README.md

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 [![Arxiv](https://img.shields.io/badge/arXiv-2407.11418-B31B1B.svg)][#arxiv-paper-package]
+[![Slack](https://img.shields.io/badge/slack-lotus-purple.svg?logo=slack)][#slack]
 [![Documentation Status](https://readthedocs.org/projects/lotus-ai/badge/?version=latest)](https://lotus-ai.readthedocs.io/en/latest/?badge=latest)
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 [![PyPI](https://img.shields.io/pypi/v/lotus-ai)][#pypi-package]
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 [#license-gh-package]: https://lbesson.mit-license.org/
 [#arxiv-paper-package]: https://arxiv.org/abs/2407.11418
 [#pypi-package]: https://pypi.org/project/lotus-ai/
+[#slack]: https://join.slack.com/t/lotus-fnm8919/shared_invite/zt-2tnq6948j-juGuSIR0__fsh~kUmZ6TJw
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 Easily build knowledge-intensive LLM applications that reason over your data with LOTUS!