SequenceDiagram 时序图/序列图
Based on SequenceDiagram.js：
http://bramp.github.io/js-sequence-diagrams/
####Using SequenceDiagram setting: { sequenceDiagram : true } #### Example ```seq A->B: Message ``` ```seq Andrew->China: Says Hello Note right of China: China thinks\nabout it China-->Andrew: How are you? Andrew->>China: I am good thanks! ```