Add evil-commentary layer.

contrib/evil-commentary/README.md

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+# Evil-commentary contribution layer for Spacemacs
+
+## Description
+
+This layer is a replaces evil-nerd-commenter with evil-commentary, 
+for those who desire behaviour like `vim-commentary`'s.
+
+> Use <kbd>gcc</kbd> to comment out a line (takes a count),
+> <kbd>gc</kbd> to comment out the target of a motion (for example,
+> <kbd>gcap</kbd> to comment out a paragraph), <kbd>gc</kbd> in visual
+> mode to comment out the selection.
+
+For more details see the [evil-commentary][] repository.
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`.
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(evil-commentary))
+```
+[evil-commentary]: https://github.com/linktohack/evil-commentary

contrib/evil-commentary/packages.el

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+;;; packages.el --- evil-commentary 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 evil-commentary-packages '(evil-commentary)
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defvar evil-commentary-excluded-packages '(evil-nerd-commenter)
+  "List of packages to exclude.")
+
+(defun evil-commentary/init-evil-commentary ()
+  "Initialize evil-commentary."
+  (use-package evil-commentary
+    :diminish evil-commentary-mode
+    :config
+    (progn
+      (evil-commentary-mode t))))