Create SECURITY.md

SECURITY.md

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+To report a security issue, please email <security@affinidi.com> with a description of the issue, the steps you took to create the issue, affected versions, and, if known, mitigations for the issue. Our vulnerability management team will respond within 5 working days of your email. If the issue is confirmed as a vulnerability, we will open a Security Advisory. This project follows a 120 day disclosure timeline.