Make a logo

[lizliz]

... and add it to all the github and documentation thingys.

[lizliz]

Can we get something inspired by the Matisse Leaf Examples?

[lizliz]

Idea from Dan Chitwood. Thoughts?

[yemeen]

I think of a black and white chi with a circle when I think ECT so something like

but if we want to stick with the plant theme I had help with this