Add SECURITY.md File

This just adds a copy of the Meta default SECURITY.md that we can then modify.

Author: felixhandte

SECURITY.md

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+# Reporting and Fixing Security Issues
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+Please do not open GitHub issues or pull requests - this makes the problem immediately visible to everyone, including malicious actors. Security issues in this open source project can be safely reported via the Meta Bug Bounty program:
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+https://www.facebook.com/whitehat
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+Meta's security team will triage your report and determine whether or not is it eligible for a bounty under our program.