docs: added architecture diagram for managed cluster, control plane (#20)

Signed-off-by: Ali Mukadam <ali.mukadam@oracle.com>

Author: hyder

docs/src/SUMMARY.md

@@ -12,8 +12,8 @@
 - [Multi Cluster](./multi/multi.md)
   - [With Public Endpoints](./multi/pub-ep.md)
   - [With Private Endpoints](./multi/pri-ep.md)
-  - [With Public Load Balancers]())
-  - [With Private Load Balancers]()
 - [Advanced Customizations](./advanced/advanced.md)
-  - [Customize DNS](./advanced/customizedns.md)
+  - [Control plane](./advanced/controlplane.md)
+  - [Data plane]()
+  - [DNS](./advanced/dns.md)
 - [Terraform Options](./terraformoptions.md)

docs/src/advanced/controlplane.md

@@ -0,0 +1,11 @@
+# Control plane
+
+Every Verrazzano cluster (whether with dev, prod or managed-cluster profile) has a control plane. This control plane allows a Verrazzano administrator to access the various admin services from outside the cluster through a load balancer. 
+
+On OCI, the Verrazzano Control Plane is front-ended by an OCI Load Balancer and the ingress-nginx controller. As such a number of configuration options are possible depending on the use case:
+
+1. access: the control plane can be made public or private. By default, it is public.
+2. shape: the load balancer shape can be configured including the bandwidth, security posture
+3. DNS: the domain used to access the control plane services
+
+Depending on the values you choose, your architecture and possibly other requirements, additional configuration may be necessary.

docs/src/advanced/customizedns.md docs/src/advanced/dns.mddocs/src/advanced/customizedns.md renamed to docs/src/advanced/dns.md

@@ -1,5 +1,13 @@
 # Multi Cluster
 
+A multi-cluster deployment in Verrazzano consists of an Admin cluster and at least 1 managed cluster. An Admin cluster contains all the same system components as in the single cluster:
+
+![Single Cluster](../images/singlecluster.svg)
+
+whereas a managed cluster typically consists only of the application workload, the service mesh and the observability components:
+
+![Managed Cluster](../images/managedcluster.svg)
+
   - [With Public Endpoints](./pub-ep.md)
   - [With Private Endpoints](./pri-ep.md)
   - [With Public Load Balancers](./pub-lb.md)