Add a couple of notes on how to use UEFI support.
Add a couple of notes on how to use UEFI support.

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