Update README.md

Author: natashaash

README.md

@@ -8,7 +8,9 @@
 
 This example shows how to implement a custom filter that reacts to the  TreeViewNode’s Text when it is split by a comma and applies custom highlighting.
 
- ![](image.png)
+ ![](CS/TreeViewCustomFilter/image.png)
+ 
+The filter accepts the [NavigationFilterInfo](http://docs.devexpress.com/Blazor/DevExpress.Blazor.NavigationFilterInfo) structure to obtain the [FilterString](http://docs.devexpress.com/Blazor/DevExpress.Blazor.DxTreeView.FilterString) value and uses a regular expression to parse the filter string. The [NodeTextTemplate](http://docs.devexpress.com/Blazor/DevExpress.Blazor.DxTreeView.NodeTextTemplate) uses a regular expression to apply custom highlighting.
 
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