update README

README

-have a look at the variables in virt-install-debian and adapt to your liking
+On server
+==============
+
+1. have a look at the variables in virt-install-debian and adapt to your liking
 
 # kick installation
 virt-install-debian
 
+# login and create /root/.ssh
+
 # shutdown
 virsh shutdown domain
 
 # copy ssh-keys of admins into machine
 virt-copy-in -d domain authorized_keys /root/.ssh/
 
+# start again
+virsh start domain
 
+On your workstation (chef master node)
+========================================