Add KVM readme file

software/kvm/README.txt

+kvm
+===
+
+Introduction
+------------
+
+This software release is used to deploy KVM instances, NBD instances and
+Frontend instances of KVM.
+
+Examples
+--------
+
+The following examples listhow to request different possible instances of KVM
+Software Release from slap console or command line.
+
+KVM instance (1GB of RAM, 10GB of SSD, one core)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Note that the KVM instance will request a frontend slave instance in order
+to be accessible from IPv4.
+
+KVM instance needs a NBD to fetch disk image at first boot. Working NBD IP/port
+has to be specified.
+
+::
+  myawesomekvm = request(
+      software_release=kvm,
+      partition_reference="myawesomekvm",
+      partition_parameter_kw={
+          "ndb_ip":"2a01:e35:2e27:460:e2cb:4eff:fed9:48dc",
+          "ndb_port": 1024
+      }
+  )
+
+
+KVM+ instance (2GB of RAM, 20GB of SSD, two cores)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+::
+  myevenmoreawesomekvm = request(
+      software_release=kvm,
+      partition_reference="myevenmoreawesomekvm",
+      partition_parameter_kw={
+          "ndb_ip":"2a01:e35:2e27:460:e2cb:4eff:fed9:48dc",
+          "ndb_port": 1024
+      },
+      software_type="kvm+",
+  )
+
+
+NBD instance
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This type of instance will allow to host a disk image that will be used by
+any KVM instance.
+
+::
+  mynbd = request(
+      software_release=kvm,
+      partition_reference="mynbd",
+      software_type="nbd",
+  )
+
+
+KVM Frontend Master Instance (will host all frontend Slave Instances)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This type of instance will allow to host any frontend slave instance requested
+by KVM instances. Slave instances (and thus KVM instance) will be accessible
+at : https://mydomain.com/instancereference .
+
+::
+  mykvmfrontend = request(
+      software_release=kvm,
+      partition_reference="mykvmfrontend",
+      partition_parameter_kw={
+          "domain":"mydomain.com"
+      },
+      software_type="frontend",
+  )