chore(vscode): Add schema validation

[ExE-Boss]

This makes it so that when viewing the files in Visual Studio Code, schema validation is performed automatically.

[tobie]

I think I'll need to be convinced why that belongs in the project.

[ExE-Boss]

@connorshea articulated the reasoning a lot better in mdn/browser-compat-data#2905 than I could.

[tobie]

Oh, I get how it works. It's just dedicated to a specific editor, and so that's the part that requires argumentation. (I'm not saying I agree or disagree, I'm saying I need a convincing argument as to why that's OK.)

[marcoscaceres]

As a VS Code user, I definitely wouldn’t say no. It’s a nice thing that doesn’t get in the way*.

• as long as it’s maintained.

[tobie]

*as long as it’s maintained.

That was my concern, too!

[marcoscaceres]

I like that it just points to our existing schema - so there is not really much to maintain. @ExE-Boss are you willing to maintain this long term (5 years, say) if we call on you?

[ExE-Boss]

I’m willing to maintain this config file.