Add editorconfig layer

contrib/editorconfig/README.md

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+# EditorConfig Layer for Spacemacs
+
+![EditorConfig](img/editorconfig.png)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [EditorConfig Layer for Spacemacs](#editorconfig-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+        - [EditorConfig](#editorconfig)
+        - [Layer](#layer)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer provides support for [EditorConfig](http://editorconfig.org/). Syntax highlighting is also provided for `.editorconfig` files.
+
+## Install
+
+### EditorConfig
+
+If you have not installed the EditorConfig C Core already, follow the instructions [here](https://github.com/editorconfig/editorconfig-core-c/blob/master/INSTALL.md).
+
+### Layer
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(editorconfig))
+```

contrib/editorconfig/packages.el

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+(defvar editorconfig-packages '(editorconfig))
+
+(defun editorconfig/init-editorconfig ()
+  (use-package editorconfig
+    :defer t
+    :init (add-to-list 'auto-mode-alist '("\\.editorconfig" . conf-unix-mode))))