Create SECURITY.md (#12671)

* Create SECURITY.md

* Updates to SECURITY.md

Co-authored-by: Jason Schindler <[email protected]>

Author: puneetbehl

SECURITY.md

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+# Security Policy
+
+The Grails® Foundation is committed to the continued innovation, development, maintenance, and support of the Grails framework.
+Our goal is to provide Grails framework users the support they need while maintaining as much focus as possible on innovation.
+The level and type of support available for earlier versions of the Grails framework will change as the framework continues to evolve.
+
+For information about the currently supported versions of the Grails framework, please see our [Support Schedule](https://grails.org/support-schedule.html).
+
+## Reporting Vulnerabilities
+
+Please reach out to us at [email protected] with any suspected security vulnerabilities within the Grails framework.