Add SECURITY.md

Author: dshafik

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+Use this section to tell people about which versions of your project are
+currently being supported with security updates.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.1.x   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+If you discover a security vulnerability within Beam, please report it at <https://github.com/beacon-hq/beam/security>.  All security vulnerabilities will be promptly addressed.