Updating readme to include ConnectToEngagementHub section

Author: vidrana

README.md

@@ -20,11 +20,13 @@ To use the samples, clone this GitHub repository using Git.
 |BotConnectorApp | Demonstrates how to connect your bot to a custom app for example mobile-device app   | [View][cs#1]|
 |BuildYourOwnCanvasSamples | Demonstrates how to connect your bot to a custom canvas with various functionality | [View][cs#2] |
 |RelayBotSample | Demonstrates how to connect your bot to existing Azure Bot Service channels | [View][cs#3] |
+|ConnectToEngagementHub | Demonstrates how to detect a handoff activity during a bot conversation and read conversation context | [View][cs#4] |
 
 
 [cs#1]:./BotConnectorApp
 [cs#2]:./BuildYourOwnCanvasSamples
 [cs#3]:./RelayBotSample
+[cs#4]:./ConnectToEngagementHub
 
 
 ## Contributing