dhall: First pass at Dhall layer

Just a very simple pass-through to the underlying `dhall-mode`.

layers/+lang/dhall/packages.el

@@ -0,0 +1,28 @@
+;;; packages.el --- Dhall Layer packages File for Spacemacs
+;;
+;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;;
+;; Author: Colin Woodbury <colin@fosskers.ca>
+;; URL: https://github.com/syl20bnr/spacemacs
+;;
+;; This file is not part of GNU Emacs.
+;;
+;;; License: GPLv3
+
+;;; Commentary:
+
+;;; Code:
+
+(defconst dhall-packages
+  '(
+    dhall-mode
+    ))
+
+(defun dhall/init-dhall-mode ()
+  "Initialize dhall-mode."
+  (use-package dhall-mode
+    :defer t
+
+    ))
+
+;;; packages.el ends here