Create SECURITY.md

Author: nibra

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+These versions are currently being supported with security updates:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 2.0.x   | :white_check_mark: |
+| 1.4.x   | :white_check_mark: |
+| < 1.4   | :x:                |
+
+## Reporting a Vulnerability
+
+To report a security issue in the core Joomla! CMS or Framework, or with a joomla.org website, please submit
+[the form on our portal](https://developer.joomla.org/security/contact-the-team.html) containing as much detail
+as possible about the issue. Additional information about our security team and their processes may be found on
+our [Security page](https://developer.joomla.org/security.html).
+
+To report an issue in a Joomla! extension, please submit it to the [Vulnerable Extensions List](https://vel.joomla.org/submit-vel).
+
+For support with a site which has been attacked, please visit the [Joomla! Forum](https://forum.joomla.org/viewforum.php?f=714).