Add lang#rst layer (#2447)

autoload/SpaceVim/layers/lang/rst.vim

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+"=============================================================================
+" rst.vim --- rst language layer
+" Copyright (c) 2016-2017 Wang Shidong & Contributors
+" Author: Wang Shidong < wsdjeg at 163.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+
+function! SpaceVim#layers#lang#rst#plugins() abort
+  let plugins = []
+  " this is forked repo, 
+  " @todo push to upstream
+  call add(plugins, ['wsdjeg/riv.vim', {'merged' : 0}])
+  return plugins
+endfunction
+
+
+function! SpaceVim#layers#lang#rst#config() abort
+  
+endfunction

docs/cn/layers/lang/rst.md

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+---
+title: "SpaceVim lang#rst 模块"
+description: "这一模块为 rst 编辑提供支持，包括实时预览。"
+lang: cn
+---
+
+# [可用模块](../../) >> lang#rst
+
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [启用模块](#启用模块)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+这一模块为 SpaceVim 提供 rst 编辑支持，包括格式化、实时预览、自动生成 TOC 等特性。
+
+## 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#rst"
+```
+

docs/layers/lang/rst.md

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+---
+title: "SpaceVim lang#rst layer"
+description: "Take Notes in reStructuredText, autopreview in the default browser."
+---
+
+# [Available Layers](../../) >> lang#rst
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for taking notes in reStructuredText.
+
+## Install
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#rst"
+```
+