Modify README.

	modified:   Gemfile
	modified:   README.md
	new file:   bin/mplug163
	modified:   lib/mplug163.rb
	deleted:    lib/mplug163/main.rb
	modified:   lib/mplug163/menu.rb
	modified:   lib/mplug163/player.rb
	modified:   lib/mplug163/ui.rb
	modified:   lib/mplug163/version.rb
	modified:   mplug163.gemspec