Podinfo example app documentation and assets

[v-ctiutiu]

Overview

Podinfo sample application follows below guidelines:

1. Dedicated folder - podinfo-example to store all application documentation and assets.
2. Dedicated README file for main documentation.
3. All assets (such as images) go in the assets subfolder.
4. A dedicated subfolder such as kustomize is used to hold kustomization manifests.
5. Application source code (if any) should go in the src subfolder.