Add SECURITY.md with security policy details

This document outlines the security policy, version support, and vulnerability reporting process.

Author: JonDevOps

.github/SECURITY.md

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+# Security Policy
+
+This document outlines our security policy for the codebase, and how to report vulnerability.
+
+## Versions
+
+| Version     | Branch                   | Supported          | Website active   |
+| ----------- | ------------------------ | ------------------ | ---------------- |
+| production  | `production` | :white_check_mark: | w3develops.org |
+| beta        | `master`                 |                    |                  |
+| development | `master`                 |                    |                  |
+
+## Reporting a Vulnerability
+
+Security issues should be emailed to security@w3develops.org, please do not create a public GitHub issue.
+
+Ensure that you are using the **latest**, **stable** and **updated** version of the Operating System and Web Browser available to you on your machine.