Added some content to readme
Added some content to readme

Signed-off-by: Marty Burns <ffa87c2f5e60eff24924e72e3c498bac16037f23@hypertek.us>

MartyBurns/OpenESPI-GreenButtonCMDTest,energyos/OpenESPI-GreenButtonCMDTest,RonPasquarelli/OpenESPI-GreenButtonCMDTest,dfcoffin/OpenESPI-GreenButtonCMDTest,dfcoffin/OpenESPI-GreenButtonCMDTest,RonPasquarelli/OpenESPI-GreenButtonCMDTest,MartyBurns/OpenESPI-GreenButtonCMDTest,energyos/OpenESPI-GreenButtonCMDTest