add manifest.json to enable PWA install support

[shashankxrm]

Summary

This PR adds pwa support by adding manifest.json to the project as guided in issue #14

Motivation

To improve our project’s Progressive Web App (PWA) support and enhance user experience, we should add a manifest.json file. This manifest will allow users to install the app on their devices.

Change Type

• 🐞 Bug fix (non-breaking fix for an issue)
• ✨ Feature (non-breaking addition)
• 🧹 Refactor (non-breaking improvements, no behavior change)
• 💥 Breaking change (fix or feature that would change existing functionality)

Checklist

• I’ve read the Contributing Guidelines
• My code matches the project’s coding style (npm run lint)
• My change introduces changes to the documentation
• I’ve updated documentation where needed
• I’ve added tests covering new behavior
• All existing and new tests pass

Related Issues

• Closes Add Web App Manifest (manifest.json) for PWA support #14

[MohamadSalman11]

Thanks, @shashankxrm — this looks good!