Add supported python version badge

Author: njooma

README.md

@@ -2,6 +2,7 @@
 [![documentation](https://img.shields.io/static/v1?label=docs&message=python.viam.dev&color=informational)](https://python.viam.dev)
 ![build status](https://github.com/viamrobotics/python-sdk/actions/workflows/test.yml/badge.svg)
 [![license](https://img.shields.io/badge/license-Apache_2.0-blue)](https://github.com/viamrobotics/viam-python-sdk/blob/main/LICENSE)
+![PyPI - Python Version](https://img.shields.io/pypi/pyversions/viam-sdk)
 
 ## (In)stability Notice