Update README.md

Author: init27

README.md

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 An e2e framework for creating, deploying and using isolated execution environments for agentic RL training, built using Gymnasium style simple APIs.
 
+[![PyPI](https://img.shields.io/pypi/v/openenv-core?color=blue)](https://pypi.org/project/openenv-core/)
 [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/meta-pytorch/OpenEnv/blob/main/examples/OpenEnv_Tutorial.ipynb) **← Try the Interactive Tutorial!**
 
 ## Overview