Created a security policy

SECURITY.md

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+# Security Policy
+
+**PLEASE DON'T DISCLOSE SECURITY-RELATED ISSUES PUBLICLY, [SEE BELOW](#reporting-a-vulnerability).**
+
+## Supported Versions
+
+October is evergreen, no one version is singled out for security fixes because there is no way to update just one version. Builds are continually released and security fixes will always be available in the latest build.
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability within OctoberCMS, please send an email to Samuel Georges at [email protected] and Luke Towers at [email protected]. All security vulnerabilities will be promptly addressed.