Create SECURITY.md

Initial Security policy for the project.

Author: ebresie

SECURITY.md

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+# Security Policy
+
+
+Python4NB is in early development so limited sercurity support is available at
+the moment.
+
+The Python4NB project leverages github workflow dependabot checks 
+(see https://github.com/ebresie/python4nb/security/dependabot) during checkins 
+and will make recommended commits with updates when applicable.
+
+## 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:                |
+
+## Reporting a Vulnerability
+
+Should additional vulnerabilities be identified, please raise an issue on 
+the python4nb github project.