add readme on yolo + platform DSL
add readme on yolo + platform DSL

juliandunn/opscode-omnitruck,juliandunn/opscode-omnitruck,chef/omnitruck,rhass/opscode-omnitruck,juliandunn/opscode-omnitruck,chef/opscode-omnitruck,glennmatthews/opscode-omnitruck,glennmatthews/opscode-omnitruck,chef/omnitruck,chef/omnitruck,rhass/opscode-omnitruck,glennmatthews/opscode-omnitruck,rhass/opscode-omnitruck,chef/opscode-omnitruck,chef/opscode-omnitruck