Add: appveyor and badge to readme

README.md

@@ -3,6 +3,7 @@
 [![npm version](https://img.shields.io/npm/v/npm-run-all.svg)](https://www.npmjs.com/package/npm-run-all)
 [![Downloads/month](https://img.shields.io/npm/dm/npm-run-all.svg)](https://www.npmjs.com/package/npm-run-all)
 [![Build Status](https://travis-ci.org/mysticatea/npm-run-all.svg?branch=master)](https://travis-ci.org/mysticatea/npm-run-all)
+[![Build status](https://ci.appveyor.com/api/projects/status/25sqlprgb3ha6yab?svg=true)](https://ci.appveyor.com/project/BarryThePenguin/npm-run-all)
 [![Coverage Status](https://coveralls.io/repos/mysticatea/npm-run-all/badge.svg?branch=master&service=github)](https://coveralls.io/github/mysticatea/npm-run-all?branch=master)
 [![Dependency Status](https://david-dm.org/mysticatea/npm-run-all.svg)](https://david-dm.org/mysticatea/npm-run-all)
 

appveyor.yml

@@ -0,0 +1,22 @@
+environment:
+  matrix:
+    - nodejs_version: '5'
+    - nodejs_version: '4'
+    - nodejs_version: '0.12'
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - set CI=true
+  - set AVA_APPVEYOR=true
+  - npm install -g npm@latest || (timeout 30 && npm install -g npm@latest)
+  - set PATH=%APPDATA%\npm;%PATH%
+  - npm install || (timeout 30 && npm install)
+matrix:
+  fast_finish: true
+build: off
+version: '{build}'
+shallow_clone: true
+clone_depth: 1
+test_script:
+  - node --version
+  - npm --version
+  - npm test || (timeout 30 && npm test)