Create SECURITY.md for security policy

[al3omda450]

Added a security policy document outlining supported versions and vulnerability reporting.

Thanks taking the time to contribute. This template should help guide you through the process of creating a pull request for review. Please erase any part of this template that is not relevant to your pull request:

• Have you followed the guidelines for contributors?
• Have you checked to ensure there aren't other open pull requests on the repository for a similar change?
• Is there a corresponding ticket for your pull request?
• Have you written new tests for your changes?
• Have you successfully run the project with your changes locally?

If so then please replace this section with a link to the ticket(s) it addressed, an explanation of your change and why you think we should include it. Thanks again!