Add salt config layer.

contrib/config/salt/README.md

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+# Saltstack contribution layer for Spacemacs
+
+![logo](img/saltstack.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [Saltstack contribution layer for Spacemacs](#saltstack-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer provides syntax highlighting for Saltstack files.
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(salt))
+```

contrib/config/salt/packages.el

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+;;; packages.el --- Salt Layer extensions File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2015 phils@stackoverflow & Ben Hayden
+;;
+;; Author: Ben Hayden <hayden767@gmail.com>
+;; Pulled from Stackoverflow: http://stackoverflow.com/a/27737759/76267
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+(setq salt-packages '(yaml-mode))
+
+(defun salt/init-yaml-mode ()
+  (use-package yaml-mode
+    :defer t
+    :init (progn
+            (define-derived-mode saltstack-mode yaml-mode "Saltstack"
+              "Minimal Saltstack mode, based on `yaml-mode'."
+              (setq tab-width 2
+                    indent-tabs-mode nil))
+            (add-to-list 'auto-mode-alist '("\\.sls\\'" . saltstack-mode)))))