README: Update with patch submittion note

This adds a maillist and emails to be used when posting a patch for SLOF.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
1 file changed