Add kotlin layer

layers/+lang/kotlin/README.org

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+#+TITLE: kotlin layer
+
+[[file:img/kotlin.png]]
+
+* Table of Contents                                        :TOC_4_gh:noexport:
+- [[#description][Description]]
+  - [[#features][Features:]]
+- [[#install][Install]]
+  - [[#layer][Layer]]
+  - [[#ktlint][Ktlint]]
+
+* Description
+This layer adds support for [[http://kotlinlang.org/][Kotlin]] in Spacemacs
+
+** Features:
+  - Linting with [[https://github.com/shyiko/ktlint][ktlint]] and [[https://github.com/whirm/flycheck-kotlin][flycheck-kotlin]]
+  - navigation with `ggtags`
+
+* Install
+** Layer
+   To use this configuration layer, add it to your =~/.spacemacs=. You will need to
+   add =kotlin= to the existing =dotspacemacs-configuration-layers= list in this
+   file.
+** Ktlint
+   You must install [[https://github.com/shyiko/ktlint][ktlint]] and make sure that the `ktlint` binary is on Emacs' `exec-path`

layers/+lang/kotlin/packages.el

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+;;; packages.el --- kotlin layer packages file for Spacemacs.
+;;
+;; Copyright (c) 2012-2017 Sylvain Benner & Contributors
+;;
+;; Author: Shanavas M <shanavas@disroot.org>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;;; Code:
+
+(defconst kotlin-packages
+  '(
+    kotlin-mode
+    flycheck
+    (flycheck-kotlin :requires flycheck)
+    ggtags
+    helm-gtags
+    ))
+
+(defun kotlin/post-init-flycheck ()
+  (spacemacs/enable-flycheck 'kotlin-mode))
+
+(defun kotlin/init-flycheck-kotlin ()
+  (use-package flycheck-kotlin
+    :defer t
+    :init (add-hook 'flycheck-mode-hook #'flycheck-kotlin-setup)))
+
+(defun kotlin/post-init-ggtags ()
+  (add-hook 'kotlin-mode-local-vars-hook #'spacemacs/ggtags-mode-enable))
+
+(defun kotlin/post-init-helm-gtags ()
+  (spacemacs/helm-gtags-define-keys-for-mode 'kotlin-mode))
+
+(defun kotlin/init-kotlin-mode ()
+  (use-package kotlin-mode
+    :defer t
+    :init))
+
+;;; packages.el ends here