Update README.md

README.md

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-KVS Framework
-=============
+KVS: Data Model Framework for Social Networks on DHT
+====================================================
 
 Overview
 --------
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 * Accounts
 * Meetings
 * Payments
+* Purchases
 
 This Framework provides also a Plugin for Feed Server for sequential consostency.
 All write requests with given object keys are handled by single processes in Feed Server