Update security

Author: ChiaAutomation

SECURITY.md

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+# Security Policy
+
+## Reporting a Vulnerability
+
+Please report security concerns to https://hackerone.com/chia_network.
+
+If your security issue is established to be valid, we will reach out immediately to establish
+communication channels and compensate the issue reporter for responsibly reporting security bugs via
+our bug bounty program.