Update Readme.md

Author: AlexanderKovalenko

Readme.md

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-# Dashboard for WinForms - How to Get and Process the Dashboard Item's Underlying Data
+<!-- default file list -->
+*Files to look at*:
+
+* [Form1.cs](./CS/Dashboard_ClientDataCards_Win/Form1.cs)
+<!-- default file list end -->
 
+# Dashboard for WinForms - How to Get and Process the Dashboard Item's Underlying Data
 
 The following example demonstrates how to get client data corresponding to a particular visual element using DashboardViewer's API.