[PR] Document PR check workflow in README [maven-gh-actions-shared]

[via GitHub]

slawekjaranowski opened a new pull request, #329:
URL: https://github.com/apache/maven-gh-actions-shared/pull/329

   Add a README section describing the shared `pr-check.yml` workflow added in 
#326: how to use it from a project and the behaviour of the 
`license-declaration` job.
   
   Also fix the grammar of the `pull_request_target` sentence in the Pull 
Request Automation section.
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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