adding dev GPG instructions to README
adding dev GPG instructions to README

tommywo/galen,tommywo/galen,thr0w/galen,Drooids/galen,lo1tuma/galen,tommywo/galen,stefanbirkner/galen,thr0w/galen,thr0w/galen,thhiep/galen,stefanbirkner/galen,tommywo/galen,lo1tuma/galen,lo1tuma/galen,Drooids/galen,stefanbirkner/galen,Drooids/galen,stefanbirkner/galen,thhiep/galen,lo1tuma/galen,thr0w/galen,thhiep/galen,thhiep/galen,Drooids/galen