Create SECURITY.md (#2866)

Author: MartiUK

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.3.x   | :white_check_mark: |
+| < 1.3   | ❎ |
+
+## Reporting a Vulnerability
+
+Please report any vulnerabilities to [MartiUK](https://github.com/MartiUK).
+
+Please include as much of the information listed below as you can to help us better understand and resolve the issue:
+
+The type of issue
+Full paths of source file(s) related to the manifestation of the issue
+The location of the affected source code (tag/branch/commit or direct URL)
+Any special configuration required to reproduce the issue
+Step-by-step instructions to reproduce the issue
+Proof-of-concept or exploit code (if possible)
+Impact of the issue, including how an attacker might exploit the issue