add VS Code instructions to README

[mbaiza27]

Hi there!

Marc here from the VS Code team. This PR adds support for installing this MCP Server in VS Code. We provide a one-click install button, as well as manual instructions.

Thanks so much for creating a great MCP Server!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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