Update README.md

Author: sdelamo

README.md

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+# Grails Guide - Testing a Secured Grails Application
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+This example application demonstrates how to build a test the security of a Grails app; both api and web pages. 
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+The completed example source code can be find in the `complete` directory.
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+The published guide can be found on the [Grails Guides website](http://guides.grails.org/grails-test-security/guide/index.html)