repo: Add security policy (#467)

Copied from https://github.com/ni/github-repo-template/blob/main/SECURITY.md

Author: bkeryan

SECURITY.md

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+<!-- Begin NI SECURITY.md V1.0 -->
+
+# Security
+
+NI views the security of our software products as an important part of our commitment to our users.  This includes source code repositories managed through the [NI](https://github.com/ni) GitHub organization.
+
+## Reporting Security Issues
+
+We encourage you to report security vulnerabilities to us privately so we can follow the principle of [Coordinated Vulnerability Disclosure (CVD)](https://vuls.cert.org/confluence/display/CVD).  This allows us time to thoroughly investigate security issues and publicly disclose them when appropriate.
+
+**Please do not report security vulnerabilities through public GitHub issues.**
+
+Instead, please report them by sending an email to [[email protected]](mailto:[email protected]) with sufficient details about the type of issue, the impact of the issue, and how to reproduce the issue.  You may use the [NI PGP key](https://www.ni.com/en/support/security/pgp.html) to encrypt any sensitive communications you send to us. When you notify us of a potential security issue, our remediation process includes acknowledging receipt and coordinating any necessary response activities with you. 
+
+## Learn More
+
+To learn more about NI Security, please see [https://ni.com/security](https://ni.com/security)
+
+<!-- End NI SECURITY.md -->