Verified working on PRs

Fixed not being able to get an author on PR
Extended README to explain dealing with same changes going through PR and PUSH and how to avoid duplication.

Initial release with approved plugin format.

Tested and working on PUSH. Adds commit author to the specified CODEOWNERS file.

The committing back is still a responsibility of workflow. See README for an example.

WARNING: does not validate the file, so there is a possibility if you had generic entries like / before in the file, that you will have double resolved paths. Which is for now intentional, until more research into the impact is done.