add MCP server badge

[punkpeye]

This PR adds a badge for the sql-query-mcp server listing in Glama MCP server directory.

Glama performs regular codebase and documentation checks to:

• Confirm that the MCP server is working as expected
• Confirm that there are no obvious security issues
• Extract server characteristics such as tools, resources, prompts, and required parameters.

This badge helps your users to quickly assess that the MCP server is safe, server capabilities, and instructions for installing the server.

[punkpeye]

Realized that GitHub does not recognize the project license

https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/adding-a-license-to-a-repository

Would you mind adding one?

[andyWang1688]

感谢提醒，也谢谢你指出这个问题。我重新检查了一下仓库，目前 GitHub 已经可以正确识别这个项目的许可证为 MIT 了。看起来更像是 GitHub 那边之前有一点刷新延迟，不过当前的 LICENSE 文件本身是没有问题的。再次感谢你的提醒。