add more information about install into readme
add more information about install into readme

rhafer/crowbar,MaximilianMeister/crowbar,toabctl/crowbar,rsalevsky/crowbar,aspiers/crowbar,aspiers/crowbar,vwallfahrer/crowbar,SUSE-Cloud/crowbar,aplanas/crowbar,nkrinner/crowbar,crowbar/crowbar,mmnelemane/crowbar,SUSE-Cloud/crowbar,nkrinner/crowbar,dirkmueller/crowbar,aplanas/crowbar,rhafer/crowbar,vwallfahrer/crowbar,MaximilianMeister/crowbar,tserong/crowbar,toabctl/crowbar,crowbar/crowbar,mmnelemane/crowbar,rhafer/crowbar,rsalevsky/crowbar,dirkmueller/crowbar,tserong/crowbar