Could we add a lang#processing? (#2696)

* 🎁 Add first pass of lang#processing

* Add processing.md

autoload/SpaceVim/layers/lang/processing.vim

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+"=============================================================================
+" processing.vim --- SpaceVim lang#processing layer
+" Copyright (c) 2016-2017 Wang Shidong & Contributors
+" Author: Russell Bentley < russell.w.bentley at icloud.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+""
+" @section lang#processing, layer-lang-processing
+" @parentsection layers
+" This layer is for Processing development:
+" https://processing.org
+"
+" This is based on the work from https://github.com/sophacles/vim-processing
+"
+" Requirements:
+"
+"   1. You will need a copy of processing-java. The best way to do this is to get a copy of the Processing IDE from https://processing.org/download/
+"
+"       Once you have it, run it, and then select Tools -> install
+"       "processing-java"
+"
+" @subsection Mappings
+" >
+"   Mode        Key         Function
+"   -----------------------------------------------
+"   normal      SPC l r     execute current sketch 
+" <
+
+function! SpaceVim#layers#lang#processing#plugins() abort
+  let plugins = [
+        \ ['sophacles/vim-processing', { 'on_ft' : 'processing' }],
+        \ ]
+  return plugins
+endfunction
+
+function! SpaceVim#layers#lang#processing#config() abort
+  let runner = 'processing-java --force --output=/tmp/vim-processing --sketch=$(pwd)/$(dirname %s) --run'
+  call SpaceVim#plugins#runner#reg_runner('processing', runner)
+  call SpaceVim#mapping#space#regesit_lang_mappings('processing',
+        \ function('s:language_specified_mappings'))
+endfunction
+
+function! s:language_specified_mappings() abort
+  call SpaceVim#mapping#space#langSPC('nnoremap', ['l', 'r'],
+        \ 'call SpaceVim#plugins#runner#open()', 'execute current file', 1)
+endfunction
+

docs/layers/lang/processing.md

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+---
+title: "SpaceVim lang#processing layer"
+description: "This layer is for working on Processing sketches. It provides sytnax checking and an app runner"
+---
+
+# [Available Layers](../../) >> lang#processing
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Features](#features)
+- [Install](#install)
+  - [Layer](#layer)
+- [Key bindings](#key-bindings)
+  - [Code runner](#code-runner)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for working on Processing sketches.
+It builds on top of the existing vim plugin [sophacles/vim-processing](https://github.com/sophacles/vim-processing).
+
+## Features
+
+- Syntax highlighting and indent
+- Run sketches asynchonously
+
+## Install
+
+You will need to install the `processing-java` tool.
+This is best done via the Processing IDE which can be obtained from the [processing website](https://processing.org/download/).
+Once you have the IDE, you can select Tools -> install "processing-java".
+
+### Layer
+
+To use this configuration layer, update custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#processing"
+```
+
+## Key bindings
+
+| Key bindings    | Descriptions                     |
+| --------------- | -------------------------------- |
+| `SPC l r`       | Run your sketch                  |
+
+### Code runner
+
+You can build and run your sketch with `SPC l r`.
+The sketch to run is decided based on the directory of you current buffer.
+Note that the sketch is run asynchonously, so you are free to continue editing while it is running.