Add security policy (#3)

Author: gmethvin

SECURITY.md

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+# Security Policy
+
+## Reporting Security Vulnerabilities
+
+Iterable is committed to maintaining the security and privacy of our software and customer data. We value the security research community's contributions to identifying and addressing potential vulnerabilities.
+
+If you discover a security vulnerability in this project, please report it in accordance with Iterable's Responsible Disclosure Policy:
+
+**[https://iterable.com/legal/responsible-disclosure-policy/](https://iterable.com/legal/responsible-disclosure-policy/)**
+
+The policy includes:
+
+- Responsible disclosure guidelines
+- Reporting procedures and submission form
+- Response timelines and expectations
+- Recognition and acknowledgements
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+For questions please contact **[email protected]**.
+