Add kubectl plugin

vendor/k8s.io/cli-runtime/README.md

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+# cli-runtime
+
+Set of helpers for creating kubectl commands, as well as kubectl plugins.
+
+
+## Purpose
+
+This library is a shared dependency for clients to work with Kubernetes API infrastructure which allows
+to maintain kubectl compatible behavior.  Its first consumer is `k8s.io/kubectl`.
+
+
+## Compatibility
+
+There are *NO compatibility guarantees* for this repository.  It is in direct support of Kubernetes, so branches
+will track Kubernetes and be compatible with that repo.  As we more cleanly separate the layers, we will review the
+compatibility guarantee.
+
+
+## Where does it come from?
+
+`cli-runtime` is synced from https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/cli-runtime.
+Code changes are made in that location, merged into `k8s.io/kubernetes` and later synced here.
+
+
+## Things you should *NOT* do
+
+ 1. Add API types to this repo.  This is for the helpers, not for the types.
+ 2. Directly modify any files under `pkg` in this repo.  Those are driven from `k8s.io/kubernetes/staging/src/k8s.io/cli-runtime`.
+ 3. Expect compatibility.  This repo is direct support of Kubernetes and the API isn't yet stable enough for API guarantees.
+ 4. Add any type that only makes sense only for `kubectl`.