Instructions on UI

[jasperblues]

I went to Michael Hunger's blog for instructions, however perhaps the UI could show them, or include a help option?

• create new nodes with (+ Node)
• drag relationships out of the halo of a node
  ** either to an empty space for a new node or centered over an existing one to connect them
• double click nodes and relationships to edit them, set names and properties (in a `key: “value” syntax)