docs: add CLI help

docs/cmd/tk_create_kustomization.md

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+## tk create kustomization
+
+Create or update a kustomization resource
+
+### Synopsis
+
+
+The kustomization source command generates a kustomization.kustomize.fluxcd.io resource for a given GitRepository source.
+API spec: https://github.com/fluxcd/kustomize-controller/tree/master/docs/spec/v1alpha1
+
+```
+tk create kustomization [name] [flags]
+```
+
+### Examples
+
+```
+  # Create a kustomization from a source at a given path
+  create kustomization contour \
+    --source=contour \
+    --path="./examples/contour/" \
+    --prune="instance=contour" \
+    --generate=true \
+    --interval=10m \
+    --validate=client \
+    --health-check="Deployment/contour.projectcontour" \
+    --health-check="DaemonSet/envoy.projectcontour" \
+    --health-check-timeout=3m
+
+  # Create a kustomization that depends on the previous one
+  create kustomization webapp \
+    --depends-on=contour \
+    --source=webapp \
+    --path="./deploy/overlays/dev" \
+    --prune="env=dev,instance=webapp" \
+    --interval=5m \
+    --validate=client
+
+```
+
+### Options
+
+```
+      --depends-on stringArray          kustomization that must be ready before this kustomization can be applied
+      --generate                        generate the kustomization.yaml for all the Kubernetes manifests in the specified path and sub-directories
+      --health-check stringArray        workload to be included in the health assessment, in the format '<kind>/<name>.<namespace>'
+      --health-check-timeout duration   timeout of health checking operations (default 2m0s)
+  -h, --help                            help for kustomization
+      --path string                     path to the directory containing the kustomization file (default "./")
+      --prune string                    label selector used for garbage collection
+      --source string                   GitRepository name
+      --validate string                 validate the manifests before applying them on the cluster, can be 'client' or 'server'
+```
+
+### Options inherited from parent commands
+
+```
+      --components strings   list of components, accepts comma-separated values (default [source-controller,kustomize-controller])
+      --interval duration    source sync interval (default 1m0s)
+      --kubeconfig string    path to the kubeconfig file (default "~/.kube/config")
+      --namespace string     the namespace scope for this operation (default "gitops-system")
+      --timeout duration     timeout for this operation (default 5m0s)
+      --verbose              print generated objects
+```
+
+### SEE ALSO
+
+* [tk create](tk_create.md)	 - Create commands
+
+###### Auto generated by spf13/cobra on 30-Apr-2020