更新使用 Vscode + PlantUML 绘制 UML.md

使用 Vscode + PlantUML 绘制 UML.md

@@ -27,3 +27,11 @@ Alice -> Bob : Fine, thank you, and you?
 @enduml
 ```
 
+```mermaid
+sequenceDiagram
+Bob ->> Alice : Hello, how are you
+Alice -->> Bob : Fine, thank you, and you?
+```
+
+
+更多语法请参考：[http://archive.3zso.com/archives/plantuml-quickstart.html](http://archive.3zso.com/archives/plantuml-quickstart.html)
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