Scope the README workflow badge to the Main branch

[Copilot]

The README badge was linking to the workflow without a branch filter, so its status could drift from the repository’s primary branch. This updates the badge and workflow link to explicitly track Main.

• README badge

  • Adds a branch-qualified badge image URL: badge.svg?branch=Main
  • Updates the workflow link to open the Main branch view directly
  • Adds accessible alt text for the badge image

• Result

  • The status shown in the README now reflects the Main branch workflow instead of an unscoped workflow view

<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>

• Screenshot
  • README badge preview: https://github.com/user-attachments/assets/1279a64e-7558-4794-bdde-b7d3a139bc9a

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