Adding explanation for supporting 256 color for xterm to README
Adding explanation for supporting 256 color for xterm to README

dpayne/cli-visualizer,jgkamat/cli-visualizer,dpayne/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,dpayne/cli-visualizer,dpayne/cli-visualizer,jgkamat/cli-visualizer