Add php contrib layer

contrib/lang/php/README.md

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+#PHP contribution layer for Spacemacs
+ 
+![logo](img/php.png)
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [PHP contribution layer for Spacemacs](#php-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+
+<!-- markdown-toc end -->
+
+## Description
+This layer adds PHP language support to Spacemacs
+
+Features:
+- Edit php files using [php-mode][]
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(php)
+"List of contribution to load."
+)
+```
+[php-mode]: https://github.com/ejmr/php-mode 

contrib/lang/php/packages.el

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+;;; packages.el --- PHP Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2014 Sylvain Benner
+;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
+;;
+;; Author: Sylvain Benner <sylvain.benner@gmail.com>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+(defvar php-packages '(php-mode)
+  "A list of the pacakges to install for php-mode.")
+   
+(defun php/init-php-mode ()
+  (use-package php-mode
+    :defer t
+    :mode ("\\.php\\'" . php-mode)
+  )
+)