Adding layer for dockerfile-mode

contrib/dockerfile/README.md

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+# dockerfile contribution layer for Spacemacs
+
+![logo](img/dockerfile.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [dockerfile contribution layer for Spacemacs](#dockerfile-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+    - [Key bindings](#key-bindings)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer provides syntax highlighting and build functionality for Docker files
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(dockerfile))
+```
+
+## Key bindings
+
+Key Binding   | Description
+--------------|------------------------------------------------------------
+`<SPC> m c b` | build current buffer via `dockerfile-build-buffer`

contrib/dockerfile/packages.el

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+;;; packages.el --- dockerfile Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2015 Sylvain Benner
+;; Copyright (c) 2015 Alan Zimmerman & Contributors
+;;
+;; Author: Alan Zimmerman <alan.zimm@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar dockerfile-packages
+  '(
+    dockerfile-mode
+    )
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defun dockerfile/init-dockerfile-mode ()
+  (use-package dockerfile-mode
+    :defer t
+    :config
+    (progn
+      (evil-leader/set-key-for-mode 'dockerfile-mode
+         "mcb" 'dockerfile-build-buffer
+       )))
+ )