Update README with project summary

Placeholder Adam Zwickeyrequested to merge
duo-edit-20251126-164037 into main

Updates the README to clearly describe what this project does:

  • Explains it's for headless AI agent testing in CI/CD
  • Lists the two AI assistants being tested (GitLab Duo CLI and Amazon Q Developer CLI)
  • Describes the purpose of running automated tests in non-interactive mode

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