chore: Add EditorConfig for IDE whitespace

[nschonni]

Why:

Allows IDEs and GitHub web editor to detect the whitespace settings when editing files https://editorconfig.org/

What's being changed:

Add a basic .editorconfig file, but don't run any normalizaton

Check off the following:

• All of the tests are passing.
• I have reviewed my changes in staging.
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[janiceilene]

Thanks @nschonni! I'll get this triaged for review ✨

[chiedo]

@nschonni just confirming, this .editorconfig file as you've proposed it, would make the following editors automatically conform to our whitespacing preferences that we check against with our linting?

?

[nschonni]

Yes, the whitespace settings are picked up, so when you hit the Tab key, it inserts the indicated number of spaces, and will add the EOF marker if it is missing.
For VS Code, you can added the plug-in as a recommended extension https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig, by adding a extensions.json in the .vscode folder with the following:

{
"recommendations": ["EditorConfig.EditorConfig"]
}

Didn't add that in this PR to keep the discussion focused, but I can add that in if you want.

It looks like standard that you use for the JS linting doesn't have native support for it. Standard is an oppionated wrapper around ESLint. ESLint itself recommends the whitespace rules be delegated to Prettier, which does respect EditorConfig 😆

I had taken a quick look at what flipping to plain ESLint + Prettier would look like, but it reformatted so much I didn't want to submit it out of the blue

[JasonEtco]

This looks great to me, thanks for the addition @nschonni! If I was going to write a .editorconfig file, this is exactly what I'd write 📝 I'll leave it to @chiedo or @janiceilene to actually merge this once they're ready, but 👍 from an eng perspective. ✨

[github-actions]

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