docs: update README to include PyPI downloads badge

Author: pengqun

README.md

@@ -1,6 +1,7 @@
 # ModelScope MCP Server
 
-[![PyPI - Version](https://img.shields.io/pypi/v/modelscope-mcp-server.svg)](https://pypi.org/project/modelscope-mcp-server)
+[![PyPI Version](https://img.shields.io/pypi/v/modelscope-mcp-server.svg)](https://pypi.org/project/modelscope-mcp-server)
+[![PyPI Downloads](https://static.pepy.tech/badge/modelscope-mcp-server)](https://pepy.tech/projects/modelscope-mcp-server)
 [![Docker](https://img.shields.io/badge/docker-supported-blue?logo=docker)](https://github.com/modelscope/modelscope-mcp-server/blob/main/Dockerfile)
 [![GitHub Container Registry](https://img.shields.io/badge/container-registry-blue?logo=github)](https://github.com/modelscope/modelscope-mcp-server/pkgs/container/modelscope-mcp-server)
 [![License](https://img.shields.io/github/license/modelscope/modelscope-mcp-server.svg)](https://github.com/modelscope/modelscope-mcp-server/blob/main/LICENSE)

README_zh-CN.md

@@ -1,6 +1,7 @@
 # ModelScope MCP Server
 
-[![PyPI - Version](https://img.shields.io/pypi/v/modelscope-mcp-server.svg)](https://pypi.org/project/modelscope-mcp-server)
+[![PyPI Version](https://img.shields.io/pypi/v/modelscope-mcp-server.svg)](https://pypi.org/project/modelscope-mcp-server)
+[![PyPI Downloads](https://static.pepy.tech/badge/modelscope-mcp-server)](https://pepy.tech/projects/modelscope-mcp-server)
 [![Docker](https://img.shields.io/badge/docker-supported-blue?logo=docker)](https://github.com/modelscope/modelscope-mcp-server/blob/main/Dockerfile)
 [![GitHub Container Registry](https://img.shields.io/badge/container-registry-blue?logo=github)](https://github.com/modelscope/modelscope-mcp-server/pkgs/container/modelscope-mcp-server)
 [![License](https://img.shields.io/github/license/modelscope/modelscope-mcp-server.svg)](https://github.com/modelscope/modelscope-mcp-server/blob/main/LICENSE)