Added commands to CONTRIBUTING-guide
Added commands to CONTRIBUTING-guide

weedySeaDragon/aruba,maxmeyer/aruba,AdrieanKhisbe/aruba,ducthanh/aruba,AdrieanKhisbe/aruba,dg-ratiodata/aruba,dg-ratiodata/aruba,mvz/aruba,ducthanh/aruba,ducthanh/aruba,e2/aruba,ducthanh/aruba,AdrieanKhisbe/aruba,dg-ratiodata/aruba,jasnow/aruba,jasnow/aruba,weedySeaDragon/aruba,mvz/aruba,dg-ratiodata/aruba,weedySeaDragon/aruba,cucumber/aruba,weedySeaDragon/aruba,AdrieanKhisbe/aruba,jasnow/aruba,e2/aruba,e2/aruba,jasnow/aruba,maxmeyer/aruba,e2/aruba