Create SECURITY.md

Author: kdinev

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version  | Supported          |
+| -------- | ------------------ |
+| 16.1.x   | :white_check_mark: |
+| 16.0.x   | :x:                |
+| 15.1.x   | :white_check_mark: |
+| 15.0.x   | :x:                |
+| 14.2.x   | :white_check_mark: |
+| < 14.2.x | :x:                |
+
+## Reporting a Vulnerability
+
+Please report any suspected vulnerability through the [issues](../../issues) section.