Create SECURITY.md

Author: rogerbinns

SECURITY.md

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+# Security Policy
+
+APSW depends on the underlying SQLite library and C Python implementation.  It does not
+have any addiitonal permissions above those environments.
+
+## Supported Versions
+
+All versions where the SQLite libary and C Python are supported.
+
+## Reporting a Vulnerability
+
+You can report vulnerabilities privately to rogerb@rogerbinns.com, or publicly via the
+issue tracker.