Add kubernetes layer.

layers/+tools/kubernetes/README.org

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+#+TITLE: kubernetes layer
+
+[[file:./img/kubernetes.png]]
+
+* Table of Contents                                        :TOC_4_gh:noexport:
+- [[#description][Description]]
+  - [[#features][Features:]]
+- [[#install][Install]]
+- [[#key-bindings][Key bindings]]
+
+* Description
+This layer provides the [[https://github.com/chrisbarrett/kubernetes-el#kubernetes-el][kubernetes-el]] package, a magit-style interface to the
+Kubernetes command-line client.
+
+** Features:
+  - Live-updating lists of kubernetes resources
+  - Viewing and deleting pods, configmaps and secrets
+  - Switching contexts and namespaces.
+  - Showing logs and exec'ing into containers
+  - Describing pods
+
+* Install
+To use this configuration layer, add it to your =~/.spacemacs=. You will need to
+add =kubernetes= to the existing =dotspacemacs-configuration-layers= list in this
+file.
+
+* Key bindings
+
+| Key Binding | Description                 |
+|-------------+-----------------------------|
+| ~SPC a K~   | Opens =kubernetes-overview= |

layers/+tools/kubernetes/packages.el

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+;;; packages.el --- kubernetes layer packages file for Spacemacs.
+;;
+;; Copyright (c) 2012-2017 Matt Bray & Contributors
+;;
+;; Author: Matt Bray <mattjbray@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;;; Code:
+
+(defconst kubernetes-packages
+  '(
+    kubernetes
+    kubernetes-evil
+    )
+  )
+
+(defun kubernetes/init-kubernetes ()
+  (use-package kubernetes
+    :defer t
+    ;; Autoload for 'kubernetes-overview is defined in "kubernetes-overview.el".
+    ;; Add an autoload for the whole 'kubernetes package when kubernetes-overview is called.
+    :commands (kubernetes-overview)
+    :init (spacemacs/set-leader-keys "aK" 'kubernetes-overview)))
+
+(defun kubernetes/init-kubernetes-evil ()
+  (use-package kubernetes-evil :after kubernetes-overview))
+
+;;; packages.el ends here