Slope analysis in Grasshopper

I have an autocad drawing with lots of contours. I made a terrain model of it in Rhino. How do I do slope analysis for it in Grasshopper or any other plugin for Rhino 6 /Grasshopper that helps me achieve this quickly and easily? Please provide step by step method.

I need to show slopes like

0-3% - yellow

3-10% - brown

and as slope increases, the brown colour darkness also increases. This is a reference image. That’s exactly how I want to do slope analysis.

I tried using Bison plugin but it doesn’t allow me to give data classifications like 0-10%, 10%-20%, 20-30%, 30% and above

There are some discussions/examples of approaches here: (search for slope analysis will certainly turn up some more).

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