Add to release notes

ReleaseNotes.txt

@@ -8,6 +8,18 @@ Release 2.0.0 - 22 Oct 2017
 Mantle Universal Service Library 2.0.0 is a minor feature and bug fix
 release. This release is based on Moqui Framework 2.1.0, mantle-udm 2.0.0.
 
+There are many new services (641 total in this release, 474 in the last
+release) in this release plus significant improvements to existing services
+to support additional business scenarios and so all services work together
+in a more consistent and clean way.
+
+Most of the new and improved services are for core procure to pay, order to
+cash, and accounting business processes. There are part of the primary
+effort in this release series to build out the PopCommerce ERP application
+and add more ecommerce related functionality. POPC ERP (version 2.0.0) is
+now a comprehensive, OOTB usable application for small and medium sized
+retailers, wholesalers, and distributors.
+
 Non-Backward Compatible Changes
 
 - Moved get#OrderDisplayInfo from OrderServices.xml to OrderInfoServices.xml