Add reference to SECURITY.md in section about reporting vulnerbilities.

Author: kwwall

README.md

@@ -47,6 +47,8 @@ NOTE: Please do NOT use GitHub issues to ask questions about ESAPI. If you wish
 ### Find a Vulnerability?
 If you have found a vulnerability in ESAPI legacy, first search the issues list (see above) to see if it has already been reported. If it has not, then please contact both Kevin W. Wall (kevin.w.wall at gmail.com) and Matt Seil (matt.seil at owasp.org) directly. Please do not report vulnerabilities via GitHub issues or via the ESAPI mailing lists as we wish to keep our users secure while a patch is implemented and deployed. If you wish to be acknowledged for finding the vulnerability, then please follow this process. (Eventually, we would like to have BugCrowd handle this, but that's still a ways off.) Also, when you post the email describing the vulnerability, please do so from an email address that you usually monitor.
 
+More detail is available in the file '[SECURITY.md](https://raw.githubusercontent.com/ESAPI/esapi-java-legacy/develop/SECURITY.md)'.
+
 ## Where to Find More Information on ESAPI
 
 *Wiki:* https://www.owasp.org/index.php/Category:OWASP_Enterprise_Security_API