docs: Update usage in README to make it more copy-pasty

[obedparla]

What:

Docs small update.

Why:

I spent some time going through the docs and the issues to enable it all. Could save people some time.

[codecov]

Codecov Report

Merging #326 (797ebe4) into master (70677a1) will not change coverage.
The diff coverage is n/a.

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[gnapse]

It looks good, but I'm a bit on the fence. We already linked to the jest documentation about the file where jest-dom is to be imported.

Anyway, this is not to object. But I would indeed like to better address the TS vs. JS differences (see comment below). Or hear your thoughts about my thinking.

[obedparla]

I was able to set it up with the current readme, but I needed to read into the Jest docs and find how to fix TS in the issues here, and I've used Jest a bit. So I figure some people may benefit from more hand-holding.

[gnapse]

@all-contributors please add @obedparla for docs

[allcontributors]

@gnapse

I've put up a pull request to add @obedparla! 🎉

[github-actions]

🎉 This PR is included in version 5.11.9 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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