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]

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Latest commit: 353c902

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[remix-cla-bot]

Hi @adambirds,

Welcome, and thank you for contributing to React Router!

Before we consider your pull request, we ask that you sign our Contributor License Agreement (CLA). We require this only once.

You may review the CLA and sign it by adding your name to contributors.yml.

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- The Remix team

[remix-cla-bot]

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