feat: update rn-signer readme to contain additional setup information

[iykazrji]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

This PR introduces the @account-kit/react-native-signer library, detailing its alpha status and providing installation and usage instructions, particularly for deep linking requirements.

Detailed summary

• Added a header indicating the library is in alpha.
• Specified that only the Android platform is supported.
• Included installation instructions for the library.
• Mentioned the requirement of the react-native-mmkv package.
• Provided guidance on configuring deep linking.
• Suggested checking the example app for usage information.

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Name	Status	Preview	Comments	Updated (UTC)
aa-sdk-site	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 22, 2024 9:25pm
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[iykazrji]

• feat: update rn-signer readme to contain additional setup information #1172 👈 (View in Graphite)
• moldy/rn-base

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