Create SECURITY.md

Author: iandstanley

SECURITY.md

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+# Security Policy
+
+## Supported Versions
+
+We support the following versions of this application:
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 1.0     | :white_check_mark: |
+
+
+## Reporting a Vulnerability
+
+If a vulnerability is found please report this as an ISSUE in the Issues tab. 
+If you have a fix ro suggested amendment, please feel free to fork and create a pull-request.
+
+## Expectations and Version
+
+Each release will be released with a nn.0 tag. Vulnerabilities fixes will be fixed and 
+released as a nn.x where x is incremented sequentially with each patch to the 'nn' release.
+
+We do not release fixes for prior versions. Fixes for bugs and vulnerabilities will be 
+added to the working version at HEAD and a nn.x version released.