Create SECURITY.md

[TJ5303]

Description

We should be adding SECURITY.md files to our public repos with this information.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• This is a required documentation update

How Has This Been Tested?

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Joel-hanson]

LGTM