Add support for kde-material-you-colors

[fwinn]

Hi, I'm using pywal along with kde-material-you-colors, which generates color schemes like pywal and then also provides them in pywal. But I noticed that the colors this script selects from pywal doesn't really work well together with the colors that kde-material-you-colors generates for pywal. The themes looked something like this: So I decided to write a separate script for theme generation using the colors directly from kde-material-you-colors.