adding configuration.md

Signed-off-by: Kuralamudhan Ramakrishnan <kuralamudhan.ramakrishnan@intel.com>
Change-Id: Ia591e36d5e4e8a030579fea54f686cfacf184585

diff --git a/doc/configuration.md b/doc/configuration.md
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+#OVN4NFV Configuration Reference
+
+ovn4nfv is not having any cni configuration. All the configuration are encapsulated within ovn4nfv-cni - `build/bin/entrypoint`
+
+ovn4nfv-cni daemonset creates following cni configuration file `/etc/cni/net.d/00-network.conf` in each node
+```
+{
+  "name": "ovn4nfv-k8s-plugin",
+  "type": "ovn4nfvk8s-cni",
+  "cniVersion": "0.3.1"
+}
+```
+ovn4nfv cni-server use incluster-communication and cni shim uses the out-of-cluster
+communication using the auto generated kubeconfig in each node.
+
+#logging
+
+Log is enabled by default and log file - `/var/log/openvswitch/ovn4k8s.log`
+
+ovn log and openvswitch log can be find in the `/var/log/openvswitch` & `/var/log/ovn`