Add lang#matlab layer (#2903)

* Add lang#matlab layer

* Add matlab doc

autoload/SpaceVim/layers/lang/matlab.vim

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+"=============================================================================
+" matlab.vim --- matlab support for SpaceVim
+" Copyright (c) 2016-2019 Wang Shidong & Contributors
+" Author: Wang Shidong < wsdjeg@outlook.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+function! SpaceVim#layers#lang#matlab#plugins() abort
+  let plugins = []
+  call add(plugins, ['wsdjeg/matlab.vim', {'merged' : 0}])
+  return plugins
+endfunction

docs/cn/layers/lang/matlab.md

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+---
+title: "SpaceVim lang#matlab 模块"
+description: "该模块为 SpaceVim 提供了 matlab 语言开发支持，包括语法高亮。"
+lang: cn
+---
+
+# [可用模块](../../) >> lang#matlab
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [功能特性](#功能特性)
+- [启用模块](#启用模块)
+- [快捷键](#快捷键)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+该模块为 SpaceVim 提供了 matlab 语言开发支持。
+
+## 功能特性
+
+- 语法高亮
+
+## 启用模块
+
+可通过在配置文件内加入如下配置来启用该模块：
+
+```toml
+[[layers]]
+  name = "lang#matlab"
+```
+
+## 快捷键
+
+
+在编辑 matlab 文件时，可通过快捷键 `SPC l r` 快速异步运行当前文件，运行结果会展示在一个独立的执行窗口内。
+
+

docs/layers/lang/matlab.md

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+---
+title: "SpaceVim lang#matlab layer"
+description: "This layer adds matlab language support to SpaceVim, including syntax highlighting."
+---
+
+# [Available Layers](../../) >> lang#matlab
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Features](#features)
+- [Install](#install)
+- [Running current file](#running-current-file)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer adds matlab language support to SpaceVim.
+
+## Features
+
+- syntax highlighting
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#matlab"
+```
+
+## Running current file
+
+To running current file, you can press `SPC l r` to run current file without loss focus, and the result will be shown in a runner buffer.
+