kubernetes: creating a namespace

$ cat ns-development.yaml
{
    "apiVersion": "v1",
    "kind": "Namespace",
    "metadata": {
    "name": "development",
    "labels": {
      "name": "development"
    }
  }
}
$ kubectl apply -f ns-development.yaml

To see the new namespace created:
$ kubectl get ns

OR simple create via kubectl:
$ kubectl create ns development