Create SECURITY.md

Creating an org-wide security policy based upon the Bug Bounty program definition.

SECURITY.md

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+# GitHub Security Policy
+
+Software security researchers are increasingly engaging with Internet companies to hunt down vulnerabilities. Our bounty program gives a tip of the hat to these researchers and provides rewards of $30,000 or more for critical vulnerabilities.
+
+If you’ve found a vulnerability, [submit it here](https://hackerone.com/github).
+
+You can find useful information in our [rules](https://bounty.github.com/#rules), [scope](https://bounty.github.com/#scope), [targets](https://bounty.github.com/#scope) and [FAQ](https://bounty.github.com/#faqs).