Please improve the documentation on usage of this plugin

### Describe your use-case which is not covered by existing documentation.

I want to integrate code coverage reports of Jacoco into my GitHub PRs. I want to know do I need all the files of this repo also in my project for the integration or if I can simply use the code given in usage in Jenkinsfile in the example. Please check this question for complete desciption: [Link](https://stackoverflow.com/questions/75790563/how-to-integrate-github-pull-request-coverage-status-in-jenkinsfile?noredirect=1#comment133695152_75790563)

### Reference any relevant documentation, other materials or issues/pull requests that can be used for inspiration.

_No response_