improve: README add go report card badge

Description

Added a go report card badge with link to the go-report. This will be useful to add this repository to known popular repository lists.

[x] I've read the guidelines for contributing to this repository.
[x] I've followed the conventions in the PR title.
[ ] I've added tests that prove my fix is effective or that my feature works.
[ ] I've updated the readme with the relevant information (if needed).
[ ] I've added usage information (if the PR introduces new options)
[ ] I've included a "before" and "after" example to the description (if the PR is a user interface change).