Add readme to testing chart

Author: mallardduck

charts/kubectl-test/README.md

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+# Kubectl Test Chart
+This chart facilitates testing of RC versions of `rancher/kuberlr-kubectl` image.
+
+Specifically this allows us to create, test and QA an RC version of the image without needing to involve dependent charts.
+The goal being that we shouldn't need to "mix processes" and utilize another project for testing this project.
+
+## What does this test for?
+To correctly provide a validation w/o using consuming charts, we need to ensure this chart does the same type of stuff.
+Additionally, we should ensure that when it does those actions it will create loud and obvious errors when failure happens.
+
+Some examples of scenarios this should cover:
+- Post upgrade jobs (like BRO, Monitoring),
+- Creating a `ServiceAccount` (with appropriate bindings) and using that for upgrade task (like BRO),
+- Storing upgrade scripts in a `ConfigMap` and then running them on upgrade (like Monitoring)
+
+As we find more specific use-cases within Rancher that existing scenarios do not cover, we should create issues to track adding new tests.
+
+## How does (or will) this work?
+
+This chart will be packaged as a release artifact with each GitHub release.
+In turn every tag going forward will have a direct 1:1 chart that can be used for testing and QA of that tag.
+
+Eng will create a new RC and upon success of the action, they will inform QA (via the related issue) that the RC is ready for testing.
+Once QA picks up the issue for testing they will fetch the debug/QA chart from the release and install via CLI.
+Then they will subsequently "upgrade" to the same version to trigger any upgrade specific jobs.
+
+After each phase QA will be able to verify the resources and jobs in the testing namespace.
+As long as they do not observe any errors - just as they would expect for a production chart - the RC has passed.
+Then once the `rancher/kuberlr-kubectl` tag has been un-RC'd any consuming charts can update to the new stable tag.