Add SECURITY.md file.

Author: Kami

SECURITY.md

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+# Security Policies and Procedures
+
+If you believe you found a security issue or a vulnerability, please send a description of it to
+our private mailing list at info [at] stackstorm [dot] com.
+
+Once you've submitted an issue, you should receive an acknowledgment from one our of team members
+in 48 hours or less. If further action is necessary, you may receive additional follow-up emails.
+
+For more information, please refer to https://docs.stackstorm.com/latest/security.html