add MCP server badge

[punkpeye]

This PR adds a badge for the Google Analytics MCP Server 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 with dependencies of the server
• 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.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[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?