Create installation.md to cover installation instructions.

[adambirds]

This commit will help prevent people thinking that sort-by, localforage and match-sorter are actually required by react-router-dom by following the tutorial page. See #11099.

Having a separate installation page will lead people there instead of the tutorial for those who just want to install it rather than follow a tutorial.

[changeset-bot[bot]]

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Latest commit: 353c902106f3168c1be6db6bc5b96a23583ab655

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[remix-cla-bot[bot]]

Hi @adambirds,

Welcome, and thank you for contributing to React Router!

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[remix-cla-bot[bot]]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳