Add OSCAL Assessment Plan inputs for demonstration

[jpower432]

Summary

C2P-Go supports multiple workflows to created OSCAL Assessment Results.
For example:
compdef -> assessment results
compdef -> assessment plan -> assessment results

Completetion Critera

Complete the linked sub-issues

Related Issues:
oscal-compass/oscal-sdk-go#71
oscal-compass/compliance-to-policy-go#117

[aishwarya-mathew]

Hi @jpower432 , could you please assign me to this?

[jpower432]

Hey @aishwarya-mathew. I realized that this issue has a small overlap with/dependency on oscal-compass/compliance-trestle#1879. It may be a good opportunity to collaborate on how the Assessment Plan gets created/ is available for the c2pcli. I will add more detail to the issue description/each task to explain the overlap a bit more. If there is a specific area on this effort you want to start with or started, I can add you to a specific sub issue.