Add lsp doc

docs/layers/language-server-protocol.md

@@ -0,0 +1,50 @@
+---
+title: "SpaceVim language server protocol layer"
+description: "This layers provides language server protocol for vim and neovim"
+---
+
+# [SpaceVim Layers:](https://spacevim.org/layers) lsp
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Features](#features)
+- [Install](#install)
+- [Configuration](#configuration)
+- [Key bindings](#key-bindings)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layers adds extensive support for [language-server-protocol](https://microsoft.github.io/language-server-protocol/)
+
+## Features
+
+## Install
+
+To use this configuration layer, add `call SpaceVim#layers#load('lsp')` to your custom configuration file.
+
+## Configuration
+
+To enable lsp support for a specified filetype, you may need to load this layer with `filtypes` option, for example:
+
+```vim
+call SpaceVim#layers#load('lsp',
+    \ {
+    \ 'filetypes' : ['rust',
+                   \ 'typescript',
+                   \ 'javascript',
+                   \ ],
+    \ }
+```
+
+## Key bindings
+
+| Key Binding    | Description            |
+| -------------- | ---------------------- |
+| `<Leader> g a` | git add current file   |
+| `<Leader> g A` | git add All files      |
+| `<Leader> g b` | open git blame window  |
+| `<Leader> g s` | open git status window |
+| `<Leader> g c` | open git commit window |