doc: add pypi package version badge

Author: manusa

README.md

@@ -2,6 +2,7 @@
 
 [![GitHub License](https://img.shields.io/github/license/manusa/kubernetes-mcp-server)](https://github.com/manusa/kubernetes-mcp-server/blob/main/LICENSE)
 [![npm](https://img.shields.io/npm/v/kubernetes-mcp-server)](https://www.npmjs.com/package/kubernetes-mcp-server)
+![PyPI - Version](https://img.shields.io/pypi/v/kubernetes-mcp-server)
 [![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/manusa/kubernetes-mcp-server?sort=semver)](https://github.com/manusa/kubernetes-mcp-server/releases/latest)
 [![Build](https://github.com/manusa/kubernetes-mcp-server/actions/workflows/build.yaml/badge.svg)](https://github.com/manusa/kubernetes-mcp-server/actions/workflows/build.yaml)