add screenshot

README.md

@@ -5,4 +5,16 @@ CGNPC tcp demo, contains both the server and the client.
 
 To open two projects at the same time, please refer to the following figure:
 
-![](QtCreator_setting.png)
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+![](QtCreator_setting.png)
+
+## Screenshot as follows:
+
+![](tcp_screenshot/TCP_1.png)
+
+![](tcp_screenshot/TCP_2.png)
+
+![](tcp_screenshot/TCP_3.png)
+
+![](tcp_screenshot/TCP_4.png)
+
+![](tcp_screenshot/TCP_5.png)
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