Create SECURITY.md

Author: dannyvankooten

SECURITY.md

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+# Security Policy
+
+The Mailchimp for WordPress team and community take potential security issues in our software seriously. 
+We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+## Reporting a Vulnerability
+
+To report a security issue, please email us at support@mc4wp.com or use the GitHub Security Advisory "[Report a Vulnerability](https://github.com/ibericode/mailchimp-for-wordpress/security/advisories/new)" tab.