Creates UML diagrams from plain text description.

Sequence diagrams:

More info
```sequence
Alice->Bob: Hello Bob, how are you?
Bob-->Alice: I am good thanks!
```

Flow charts:

More info
```flow
st=>start: Start
e=>end
op=>operation: My Operation
cond=>condition: Yes or No?
st->op->cond
cond(yes)->e
cond(no)->op
```

Note: Markdown Extra extension has to be enabled with GFM fenced code blocks option.