Missing README.md – add documentation to source code

I reviewed the structure of the README.md file and completed the missing sections and adjusting the formatting to follow the official Drupal README template.

I also created a merge request with these changes for your review.

jkdevsusa → made their first commit to this issue’s fork.

Hi, I have reviewed the README of MR!4, and I have added the maintainers section on the same MR, the rest of the content complies with the official Drupal template and structure.