Create Checklist Markdown for Delta

[em-c-rod]

Add a markdown file with checkboxes for controls with updates so the human user can check off and keep organized during the review. See the main comment in the Red Hat 7 delta work as an example. It could be useful to put some grouping, like "new controls" or "similar controls" in some way. Or "check text updated" or so on.

mitre/redhat-enterprise-linux-7-stig-baseline#189