add link to atom-cssfmt
add link to atom-cssfmt

shaunstanislaus/cssfmt,MhdAljuboori/stylefmt,chrismoulton/cssfmt,dmnsgn/cssfmt,janusnic/cssfmt,KeenS/cssfmt,carabina/cssfmt,yisibl/cssfmt,seka/stylefmt,morishitter/cssfmt