Add Skeleton Component

[stuarthendren]

For variant examples see https://github.com/radix-ui/design-system/blob/master/components/Skeleton.tsx

Assignees: stuarthendren
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[commitd-bot]

🎉 This issue has been resolved in version 6.1.0 🎉

The release is available on:

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

Your semantic-release bot 📦🚀