Update README.md

Author: octopus2023-inc

README.md

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 # 🌐 GenSphere
 [![Documentation Status](https://readthedocs.org/projects/gensphere/badge/?version=latest)](https://<project-slug>.readthedocs.io/en/latest/?badge=latest)
+[![PyPI version](https://badge.fury.io/py/gensphere.svg)](https://badge.fury.io/py/gensphere)
 
 Check the [medium article here](https://medium.com/p/182fd2a70e3e). GenSphere is a **declarative framework** to build LLM applications and an open platform to push and pull them. **Think of Docker for LLM applications.**