Added security policy

SECURITY.md

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+# Security Policy
+
+<!-- ## Supported Versions
+
+We actively support BigBlueButton through the community forums and through security updates.
+
+| Version | Supported          |
+| ------- | ------------------ | -->
+
+
+## Reporting a Vulnerability
+
+If you believe you have found a security vulnerability in BigBlueButton or its ecosystem (Greenlight, plugins, etc) please let us know directly by
+- using GitHub's "Report a vulnerability" functionality on https://github.com/bigbluebutton/bigbluebutton/security/advisories
+- or e-mailing security@bigbluebutton.org with as much detail as possible.
+
+Regards,... [BigBlueButton Team](https://docs.bigbluebutton.org/support/faq.html#bigbluebutton-committer)