Add nomos usage instructions to validate Config Management System changes

[daniel-cit]

Expected Behavior

in step 6, after we push the changes for the Config Management System we should know if they were successfully applied.

Actual Behavior

There is no feedback if the Config Management System changes wer successful.

The only way is to go to the Logs Explorer in the GKE project and search the reconciler logs using:

resource.type="k8s_container"
resource.labels.namespace_name="config-management-system"
resource.labels.container_name="reconciler"

Steps to Reproduce the Problem

1. deploy up to step 6
2. add an invalid change in one of the yaml files under root-config-repo
3. add a valid change in another yaml files under root-config-repo.
4. push the change to the repo
5. There is no clear indication that the update failed but for the fact that you can't see any of the changes in the Kubernetes Engine object browser.

Suggestion

• Add instructions to install nomos for the same version of the Config Management System in a folder in the path.
• Add instructions to validate the configuration (nomos vet) and to check if the update was successful (nomos status)

Specifications

• Version: de00f4fe2540912949a6fc32691c14964211c2d3
• Platform: Ubuntu 20.04

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