Create SECURITY.md (#377)

Author: zivnevo

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.8.x   | :white_check_mark: |
+| 1.7.x   | :white_check_mark: |
+| 1.1.x   | :x:                |
+| 1.0.x   | :x:                |
+| < 1.0   | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security issue, please email [email protected] with a description of the issue,
+the steps you took to create the issue, affected versions, and, if known, mitigations for the issue.
+
+We will respond within 7 working days of your email, and let you know if the issue is confirmed as a vulnerability and how it is going to be handled.