Enhance README.md with detailed explanations of Screen Time APIs, ins… (#58)

* Enhance README.md with detailed explanations of Screen Time APIs, installation instructions, and examples for using the FamilyControl, ShieldConfiguration, and ActivityMonitor APIs.

* Update README.md to enhance structure with a comprehensive table of contents, clarify API usage, and improve installation instructions for Expo and bare React Native projects.

* Update README.md

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* Update README.md

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* Update README.md

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* Update README.md

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* Update README.md

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* Refine README.md for clarity and consistency, including capitalization adjustments, improved phrasing, and additional import statements for better code examples.

* Update README.md to include a direct link to Apple's Screen Time APIs video and add a blank line for improved readability.

* Update README.md

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* Update README.md

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* Fix formatting issues in README.md by correcting code block syntax and adding blank lines for improved readability.

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Author: Arlevoy