Add docs

docs/layers/lang/javascript.md

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+---
+title: "SpaceVim lang#javascript layer"
+---
+
+# [SpaceVim Layers:](https://spacevim.org/layers) lang#javascript
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Layer Installation](#layer-installation)
+- [Features](#features)
+- [Layer configuration](#layer-configuration)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for JavaScript development.
+
+## Layer Installation
+
+To use this configuration layer, add `call SpaceVim#layers#load('lang#javascript')` to your custom configuration file.
+
+## Features
+
+- auto-completion
+- syntax checking
+- goto definition
+- refernce finder
+
+## Layer configuration
+
+`auto_fix`: auto fix problems when save files, disabled by default. if you need this feature, you can load this layer via:
+
+```vim
+call SpaceVim#layers#load('lang#javascript',
+            \ {
+            \ 'auto_fix' : 1,
+            \ }
+            \ )
+
+```