Replace README.txt with README.md and update file format

I have created MR! 3 kindly review and verify,
thanks.

Hi sarwan_verma

I reviewed your MR!3 and the status is Draft and the README.md file of it isn't following the README.md template.
https://www.drupal.org/docs/develop/managing-a-drupalorg-theme-module-or... →

Drupal recommends the following README sections:

Project name and introduction (required)
Table of contents (optional)
Requirements (required)
Recommended modules (optional)
Installation (required, unless a separate INSTALL.md is provided)
Configuration (required)
Troubleshooting & FAQ (optional)
Maintainers (optional)

Thanks