Update README.md
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Authentication state is maintained in a Cookie or in an HTTP Session. The
password is only submitted when first authenticating.
-This module is part of the [Apache Sling](https://sling.apache.org) project.
+This module is part of the [Apache Sling](https://sling.apache.org) project. You can read more about this module on our [documentation site](http://sling.apache.org/documentation/the-sling-engine/authentication/authentication-authenticationhandler/form-based-authenticationhandler.html).
