Add lua configuration layer

contrib/lang/lua/README.md

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+# Lua contribution layer for Spacemacs
+
+![logo](img/lua.gif)
+
+<!-- markdown-toc start - Don't edit this section. Run M-x markdown-toc/generate-toc again -->
+**Table of Contents**
+
+- [Lua contribution layer for Spacemacs](#lua-contribution-layer-for-spacemacs)
+    - [Description](#description)
+    - [Install](#install)
+    - [Key Bindings](#key-bindings)
+
+<!-- markdown-toc end -->
+
+## Description
+
+This layer adds support for editing Lua.
+
+Features:
+- Editing lua files using [lua-mode][]
+- Sending code to a lua REPL
+
+## Install
+
+To use this contribution add it to your `~/.spacemacs`
+
+```elisp
+(setq-default dotspacemacs-configuration-layers '(lua)
+  "List of contribution to load."
+)
+```
+
+## Key Bindings
+
+### commands
+
+    Key Binding      |                 Description
+---------------------|------------------------------------------------------------
+<kbd>SPC m d</kbd>   | lookup thing at point in lua documentation
+<kbd>SPC m s b</kbd> | send buffer contents to REPL
+<kbd>SPC m s f</kbd> | send current function to REPL
+<kbd>SPC m s r</kbd> | send current region to REPL
+<kbd>SPC m s l</kbd> | send current line to REPL
+
+[lua-mode]: https://github.com/immerrr/lua-mode 

contrib/lang/lua/packages.el

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+(defvar lua-packages
+  '(
+    lua-mode
+    )
+  "List of all packages to install and/or initialize. Built-in packages
+which require an initialization must be listed explicitly in the list.")
+
+(defun lua/init-lua-mode ()
+  (use-package lua-mode
+    :defer t
+    :mode ("\\.lua\\'" . lua-mode)
+    :interpreter ("lua" . lua-mode)
+    :config
+    (progn
+      (setq lua-indent-level 2
+            lua-indent-string-contents t)
+      (evil-leader/set-key-for-mode 'lua-mode "md" 'lua-search-documentation)
+      (evil-leader/set-key-for-mode 'lua-mode "msb" 'lua-send-buffer)
+      (evil-leader/set-key-for-mode 'lua-mode "msf" 'lua-send-defun)
+      (evil-leader/set-key-for-mode 'lua-mode "msl" 'lua-send-current-line)
+      (evil-leader/set-key-for-mode 'lua-mode "msr" 'lua-send-region))))