docs: install details for expo build properties

[Conor-Hinchee]

Description

I am wanting to add some clarification in the getting started guide when following the Expo path and iOS build.

Documentation currently indicates that configuration of expo-build-properties in app.json is required but it seems to be missing details that the package must be installed.

Hoping this helps to add clarity.

Referencing this StackOverflow question

Related issues

N/A

Release Summary

Docs: Added clarity to the getting started guide for iOS + Expo

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

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