Add Example Usage for JSON Output

Summary

Add Example Usage for JSON Output

Background

Provide an example on the main readme page illustrating how to generate an output report in JSON format.

Tasks

1. Add example command line usage showing how to generate a JSON report
2. (Optional) Provide a sample (sanitized) JSON report and store it in this repository (allows consumers to see a working example report)

Acceptance Criteria

1. Example usage displayed on the main readme page.
2. (optional) users can view publically accessible example JSON report