Create SECURITY.md

Author: asabaylus

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+The latest version of react-command-palette will be patched regularly as fixes become available.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| < 1.0   | :white_check_mark: |
+
+## Reporting a Vulnerability
+
+To report a vulnerability simply open a Github issue. You can expect to 
+receive a response with a day or two, though this is not a hard and fast rule.
+If the vulnerability is accepted it will be prioritized relative to its severity.
+As a general principal security issues are prioritized ahead of all other work. 
+If the issue is declined the rational will be note in Github issue.