Create SECURITY.md (#123)

Author: brantburnett

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.2.x   | :white_check_mark: |
+| 1.1.x   | :white_check_mark: |
+| 1.0.x   | :x:                |
+
+## Reporting a Vulnerability
+
+Vulnerabilities may be reported to bburnett@centeredgesoftware.com. Please do not file vulnerabilities as issues, as doing so is public.
+The report will generally not be made public until it is confirmed and resolved. Once reported, you will receive an email response 
+within a few days. The resolution, if any, will typically be available within a few days as well.