Restore the Main workflow badge and replace the broken workflow file

[Copilot]

The repository referenced a main.yml Actions badge, but .github/workflows/main.yml was not a valid workflow file, so the badge could not reflect meaningful status. This updates the workflow definition and surfaces its badge in the README.

• Workflow repair

  • Replaced the invalid contents of .github/workflows/main.yml with a minimal GitHub Actions workflow named Main
  • Triggers on push, pull_request, and workflow_dispatch
  • Restricts token scope with explicit read-only permissions

• Validation scope

  • Keeps CI aligned with the repo’s actual shape as a static site
  • Validates all root-level JavaScript files with syntax checks instead of dependency installation

  jobs:
    validate:
      runs-on: ubuntu-latest
      permissions:
        contents: read
      steps:
        - uses: actions/checkout@v4
        - uses: actions/setup-node@v4
          with:
            node-version: 20
        - run: node --check *.js

• README badge

  • Added the Main workflow badge directly under the project title in README.md

  [![Main Workflow](https://github.com/phuquoc81/Fastcash/actions/workflows/main.yml/badge.svg)](https://github.com/phuquoc81/Fastcash/actions/workflows/main.yml)

• Screenshot

  • README badge preview: https://github.com/user-attachments/assets/3a0fddcc-a862-437c-8823-eca3e222c70e

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