Update README.markdown
Update README.markdown

added rasp pi instructions 
tpltnt/SimpleCV,jlegendary/SimpleCV,jyt109/SimpleCV,jlegendary/SimpleCV,jlegendary/SimpleCV,gskielian/SimpleCV,hayd/SimpleCV,hurdlea/SimpleCV,beni55/SimpleCV,onaclovtech/SimpleCV,sightmachine/SimpleCV2,jlegendary/SimpleCV,hurdlea/SimpleCV,nils-werner/SimpleCV,jlegendary/SimpleCV,sightmachine/SimpleCV,sightmachine/SimpleCV,sightmachine/SimpleCV2,tpltnt/SimpleCV,gskielian/SimpleCV,hayd/SimpleCV,hurdlea/SimpleCV,onaclovtech/SimpleCV,beni55/SimpleCV,gskielian/SimpleCV,jayrambhia/SimpleCV2,sightmachine/SimpleCV,jyt109/SimpleCV,sightmachine/SimpleCV,beni55/SimpleCV,nils-werner/SimpleCV,hurdlea/SimpleCV,sightmachine/SimpleCV2,onaclovtech/SimpleCV,hayd/SimpleCV,jyt109/SimpleCV,tpltnt/SimpleCV,sightmachine/SimpleCV2,nils-werner/SimpleCV,beni55/SimpleCV,sightmachine/SimpleCV,hurdlea/SimpleCV,hayd/SimpleCV,tpltnt/SimpleCV,jayrambhia/SimpleCV2,gskielian/SimpleCV,onaclovtech/SimpleCV,tpltnt/SimpleCV,jayrambhia/SimpleCV2,jayrambhia/SimpleCV2,beni55/SimpleCV,hayd/SimpleCV,nils-werner/SimpleCV,jyt109/SimpleCV,gskielian/SimpleCV,jyt109/SimpleCV,nils-werner/SimpleCV,onaclovtech/SimpleCV