Improve README workflow badge markup

[Copilot]

The issue was centered on the GitHub Actions badge snippet in the README. This updates that badge markup without changing the existing workflow target or branch-specific badge behavior.

• README badge

  • Keeps the badge linked to .github/workflows/main.yml
  • Preserves the Main branch-specific query parameters already used for stable status display
  • Adds accessible alt text to the embedded badge image

• Markup change

  <a href="https://github.com/phuquoc81/Fastcash/actions/workflows/main.yml?query=branch%3AMain">
    <img
      src="https://github.com/phuquoc81/Fastcash/actions/workflows/main.yml/badge.svg?branch=Main"
      alt="Main workflow status"
    >
  </a>

• Scope

  • Documentation-only change in README.md
  • No workflow logic or application behavior changes

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[Copilot]

Pull request overview

Updates the GitHub Actions workflow badge markup in README.md to improve accessibility while preserving the existing workflow link and Main branch-specific status behavior.

Changes:

• Adds alt text to the embedded workflow badge image.
• Keeps the badge link targeting .github/workflows/main.yml with the Main branch query parameters unchanged.

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