Pin README workflow badge to the Main branch

[Copilot]

The README badge referenced the workflow file but did not explicitly scope the badge to the repository’s primary branch. This updates the badge/link pair so the status shown in the README consistently reflects the Main branch workflow.

• README badge targeting

  • Scope the workflow badge image to branch=Main
  • Scope the workflow link to the Main branch run view

• Result

  • The README badge now resolves against the active primary-branch workflow instead of relying on implicit default-branch behavior

<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">
</a>

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[Copilot]

Pull request overview

Updates the GitHub Actions status badge in the README so it consistently reflects the repository’s primary Main branch workflow status, rather than relying on implicit default-branch behavior.

Changes:

• Scope the workflow badge image URL to branch=Main.
• Scope the badge link to the workflow runs view filtered by branch:Main.

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