Make the new graph declaration more visual

[chrisalley]

As an enhancement, mermaid diagrams could use a special character to declare a new graph and direction. This would be more visually obvious than acronyms and would internationalise better. Instead of

graph TB
graph BT
graph RL
graph LR

use these characters:

v
^
<
>

[knsv]

do you mean by using something like

graph >

or just

>

[chrisalley]

If possible, it would be nice to avoid English words (for better internationalisation).

[vijay40]

It will be good if we keep the syntax as 'graph >' instead of just '>' as knsv pointed our in Issue #36 that graph keyword is used for figuring out that the diagram is of flow type.

@knsv Please let me know if nobody is currently working on it then I like to get started on it.

[knsv]

Go ahead! Will put is as assigned.

[vijay40]

But which syntax should we implement 'graph >' or '>' ?

[knsv]

I think we need the keyword as identifier for type of graph

[knsv]

I think this one should be closed. Thanks Vijay!