Add SECURITY.md (#287)

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+# Reporting security issues
+
+Thanks for your interest in making Recog more secure! If you feel
+that you have found a security issue involving Metasploit, Meterpreter,
+Recog, or any other Rapid7 open source project, you are welcome to let
+us know in the way that's most comfortable for you.
+
+## Via ZenDesk
+
+You can click on the big blue button at [Rapid7's Vulnerability
+Disclosure][r7-vulns] page, which will get you to our general
+vulnerability reporting system. While this does require a (free) ZenDesk
+account to use, you'll get regular updates on your issue as our software
+support teams work through it. As it happens [that page][r7-vulns] also
+will tell you what to expect when it comes to reporting vulns, how fast
+we'll fix and respond, and all the rest, so it's a pretty good read
+regardless.
+
+## Via email
+
+If you're more of a traditionalist, you can email your finding to
+[email protected]. If you like, you can use our [PGP key][pgp] to
+encrypt your messages, but we certainly don't mind cleartext reports
+over email.
+
+## NOT via GitHub Issues
+
+Please don't! Disclosing security vulnerabilities to public bug trackers
+is kind of mean, even when it's well-intentioned, since you end up
+dropping 0-day on pretty much everyone right out of the gate. We'd prefer
+you didn't!
+
+[r7-vulns]:https://www.rapid7.com/security/disclosure/
+[pgp]:https://keybase.io/rapid7/pgp_keys.asc?fingerprint=9a90aea0576cbcafa39c502ba5e16807959d3eda
+