Adds NTIA SBOM Validator

[saramaebee]

This is a tool for validating CycloneDX SBOMs against the NTIA's Minimum Required Elements for an SBOM

[saramaebee]

Force push was just to add the DCO message :)

[mrutkows]

Unsure of what "BEFORE you submit" means. Relative to what process? Borrowing from the "key features" section of the tool website, perhaps the description would better include the bullets from there:

• Detailed validation feedback
• Dependency graph visualization and validation

[saramaebee]

Thanks for the feedback. I've updated the description to explain a little better :)

[stevespringett]

Note: The CycloneDX team is in the process of migrating the legacy Tool Center datafile (tools.yaml) to the new Tool Center v2 format (tools.json). This work is expected to be complete by the end of May.

Once the migration to the v2 datafile is complete:

• The information in this PR will need to be made against the new datafile.
• PRs will not be accepted against the v2 datafile until the migration is complete.
• The legacy datafile and schema will be permanently removed.

Information about the new Tool Center v2 schema can be found at: https://cyclonedx.github.io/tool-center/