Created a VSCode extension

[hokaccha]

https://marketplace.visualstudio.com/items?itemName=hokaccha.vscode-graphql-schema-linter

I've recently created a VSCode extension for the graphql-schema-linter, which aims to improve the development experience for GraphQL users. I was wondering if you might be interested in adding a link to the extension in the graphql-schema-linter README, so more people can discover and benefit from it.

If you're open to this idea, I'm happy to create a Pull Request to add the link. If you're not interested or don't think it's a good fit, please feel free to close this issue. Regardless, thank you for your work on the graphql-schema-linter, it has been a great help to the community!