Extend documentation with end-to-end application deployment scenario

[ytsarev]

We already have all mechanics and automation to deploy ohmyglb locally(and also remotely) with some globally loadbalanced application on top. For local testing scenario we are using https://github.com/stefanprodan/podinfo as a sample application.

In context of this issue we want to extend README with end-to-end Howto which would include:

• Local 2-cluster ohmyglb setup
• Deployment of sample application workload on top ( podinfo )
• Demonstration of currently implemented RoundRobin and Failover strategies

We also might want to configure/modify podinfo to expose ohmyglb GeoTag right in the user interface so it will be highly illustrative in context of loadbalancing strategies demonstration in action.