Create SECURITY.md

Author: SingingBush

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We only support the latest major/minor release. Fixes for security issues that do not require breaking changes will be released a bugfix version.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 0.5.x   | :white_check_mark: |
+| < 0.5   | :x:                |
+
+## Reporting a Vulnerability
+
+Development on ddbc is not particularly active. If a vulnerability is found please consider making a pull request with a description of the problem and the appropriate fix. Appropriate testing should also be included.