docs: document EAS build profiles

[Vivian-04]

PR #125 Documentation for EAS Build Profiles

Description

This PR adds a detailed "Build Profiles" section to the README.md. It documents the various EAS build configurations (development, preview, production) used in the project, explaining their purposes and providing the necessary commands for building and submission.

Type of Change

• Documentation update

How Has This Been Tested?

• Verified the markdown rendering in README.md.
• Cross-referenced commands with eas.json configuration.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Closes #125

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@Vivian-04 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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