Add mermaid screenshot.

README.md

@@ -42,6 +42,11 @@ EAF is an extensible framework, one can develop any Qt5 application and integrat
 |                                                |           |
 
 
+| Mermaid                                          |
+| :--------:                                       |
+| <img src="./screenshot/mermaid.gif" width="400"> |
+|                                                  |
+
 
 ## Install
 1. Make sure to have ```python3``` installed, and use ```pip3``` to install all EAF dependencies (see below list for details)

README.zh-CN.md

@@ -41,6 +41,12 @@ EAF是一个可编程扩展的框架，你可以开发自己的Qt5应用并集
 | <img src="./screenshot/aria2.gif" width="400"> | <img src="./screenshot/mindmap.gif" width="400"> |
 |                                                |                                                  |
 
+| 流程图                                            |
+| :--------:                                       |
+| <img src="./screenshot/mermaid.gif" width="400"> |
+|                                                  |
+
+
 ## 安装
 1. 先确认系统中已经安装了 ```python3```，然后使用 ```pip3``` 安装EAF依赖库: