add thrumdev comfyUI link to README

[rphmeier]

Hi, I'm submitting a PR for consideration to add our implementation of ComfyUI support to the README.

Though there are already many node implementations, ours stands out because it is compatible with ComfyUI-native approaches to sampling and enables UNO to be used in very flexible and impressive ways.

We will be updating this repo with workflows and examples.

and thanks for your work on this impressive piece of technology!