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


Former-commit-id: 6f92a6f8a051c98707feaefcc2d6f749ca3a5279
dpayne/cli-visualizer,dpayne/cli-visualizer,dpayne/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,jgkamat/cli-visualizer,dpayne/cli-visualizer,jgkamat/cli-visualizer