use markdown in readme

README.md

@@ -5,34 +5,40 @@ their libvirt VM(s) through SSH. Currently supported is starting/stopping VMs,
 serial console and listing all VMs to get their status. Authorization is done
 using SSH public keys.
 
-Configuration:
+Configuration
+=============
 
 1. Create a user "vmadmin".
 
 2. Give that user sudo permissions for calling virsh, so she may control (all)
    VMs:
 
+  <pre>
   Defaults:vmadmin !requiretty
   vmadmin ALL = (root) NOPASSWD: /usr/bin/virsh
+  </pre>
 
 3. For every one of your users, create a line in vmadmin's .ssh/authorized_keys
    using their SSH public keys:
 
-   command="/usr/local/bin/virssh myfancyvm",permitopen="localhost:5915",no-X11-forwarding,no-agent-forwarding ssh-rsa AAAAB...== myfancyuser@hjome
+   <pre>command="/usr/local/bin/virssh myfancyvm",permitopen="localhost:5915",no-X11-forwarding,no-agent-forwarding ssh-rsa AAAAB...== myfancyuser@hjome</pre>
 
    Instead of specifying only one VM "myfancyvm", you may also specify multiple
    VMs by regex, for example "(myfancyvm|myothervm)".
 
-Usage:
+Usage
+=====
 
   The user may now control her VM using the following commands:
 
+  <pre>
     ssh -t vmadmin@vmserver sudo virsh list
     ssh -t vmadmin@vmserver sudo virsh console myfancyvm
     ssh -t vmadmin@vmserver sudo virsh destroy myfancyvm
     ssh -t vmadmin@vmserver sudo virsh shutdown myfancyvm
     ssh -t vmadmin@vmserver sudo virsh start myfancyvm
     ssh -t vmadmin@vmserver sudo virsh start myfancyvm --console
+  </pre>
 
   If you use a "permitopen" directive, that user may also use the console 
   command to keep an SSH tunnel open to use VNC.