Update README.md

Author: tylerchessman

README.md

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 Guidance for establishing a Power BI Center of Excellence
 
 ### Summary
-There are several publicly available resources that discuss and describe a Center of Excellence (COE) for an enterprise Power BI environment.  This repository is intended to introduce (and link to) these existing resources.  Additionally, key pieces of information have been extracted/synthesized to provide a starting point i.e., succinct, practical guidance for defining and implementing a COE.
+There are several publicly available resources that discuss and describe a Center of Excellence (COE) for an enterprise Power BI environment.  This document is intended to introduce these existing resources.  Key pieces of information have been extracted/synthesized to provide a starting point i.e., succinct, practical guidance for defining and implementing a COE.  Suggested action items, along with highlights from an initial (and ongoing) implementation (“case study”), are also included.