chore(tests): add AppVeyor support

.appveyor.yml

@@ -0,0 +1,29 @@
+platform:
+- x86
+- x64
+environment:
+  nodejs_version: "6"
+  matrix:
+  - node_installer: npm
+  - node_installer: yarn
+cache:
+- '%APPDATA%\npm-cache'
+- '%USERPROFILE%\.electron'
+branches:
+  only:
+  - master
+
+install:
+- ps: Install-Product node $env:nodejs_version $env:platform
+- npm install -g npm@4
+- npm install -g yarn
+- set PATH=%APPDATA%\npm;%PATH%
+- npm install
+
+test_script:
+- node --version
+- npm --version
+- yarn --version
+- npm test -- --installer=$env:node_installer
+
+build: off

README.md

@@ -1,6 +1,7 @@
 Electron Forge
 --------------
-[![Build Status](https://travis-ci.org/electron-userland/electron-forge.svg?branch=master)](https://travis-ci.org/electron-userland/electron-forge)
+[![Linux/macOS Build Status](https://travis-ci.org/electron-userland/electron-forge.svg?branch=master)](https://travis-ci.org/electron-userland/electron-forge)
+[![Windows Build status](https://ci.appveyor.com/api/projects/status/79ae80nek1eucyy3?svg=true)](https://ci.appveyor.com/project/electron-userland/electron-forge)
 [![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
 [![npm version](https://badge.fury.io/js/electron-forge.svg)](https://www.npmjs.com/package/electron-forge)
 [![npm](https://img.shields.io/npm/dt/electron-forge.svg?maxAge=2592000)](https://www.npmjs.com/package/electron-forge)