feat: add CI badge to README for visibility of build status

[annurdien]

Description

Please include a summary of the changes and the related issue. Please also include relevant motivation and context.

Fixes # (issue)

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Unit tests pass
• Integration tests pass
• Manual testing performed

Test Configuration:

• OS: [e.g. macOS, Linux, Windows]
• Go version: [e.g. 1.21.0]
• Device types tested: [e.g. iOS Simulator, Android Emulator]

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
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Screenshots (if applicable):

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Additional Notes:

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[Copilot]

Pull Request Overview

This PR adds a CI status badge to the README.md file to provide visibility into the build status of the project's continuous integration pipeline.

• Adds a GitHub Actions CI badge that links to the workflow status page
• Improves project transparency by displaying current build status to visitors