Merge pull request #325 from education/archive-repo

Update README.md

README.md

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+## Repo Archived
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+NOTE: This Action is no longer used for Autograding tests created via the GitHub Classroom GUI. See our [docs on Autograding](https://docs.github.com/en/education/manage-coursework-with-github-classroom/teach-with-github-classroom/use-autograding#grading-methods) for more information
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 ## Autograding
 
 GitHub Classroom Autograding is a GitHub Action that classroom admins can use to automate the grading of student assignments.