Update examples and tests

[cmckeen]

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests to us.

Proposed Changes

• Updated "example" directory so it will show properly in the registry
• Added readme to asg-dns-agent directory

Checklist

• Read the CONTRIBUTING document.
• Read the CODE OF CONDUCT document.
• Add tests to cover changes.
• Ensure your code follows the code style of this project.
• Ensure CI and all other PR checks are green OR
  • Code compiles correctly.
  • Created tests which fail without the change (if possible).
  • All new and existing tests passed.
• Improve and update the README (if necessary).