Expand summary in README

README.md

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 # glimmer-resolver [![Build Status](https://secure.travis-ci.org/glimmerjs/glimmer-resolver.svg?branch=master)](http://travis-ci.org/glimmerjs/glimmer-resolver)
 
-Resolver for Glimmer applications.
+A resolver for both Ember and Glimmer applications that is compliant with the
+interfaces defined in [glimmer-di](https://github.com/glimmerjs/glimmer-di) and
+the expectations of Ember's
+[module unification RFC](https://github.com/emberjs/rfcs/blob/master/text/0143-module-unification.md).
 
 ## Acknowledgements