Update README.md

Author: yanjinhuagood

README.md

@@ -114,6 +114,11 @@ xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers"
 
 <img src="https://github.com/WPFDevelopersOrg/ResourcesCache/raw/main/resources/WPFDevelopersResource/MultiSelectComboBox.jpg"/>   
 
+----------
+### ScreenCaptureExt‎
+
+<img src="https://github.com/WPFDevelopersOrg/ResourcesCache/raw/main/resources/WPFDevelopersResource/ScreenCaptureExt.jpg"/>   
+
 ----------
 ### PathIcon‎