adds appveyor config

appveyor.yml

@@ -0,0 +1,44 @@
+# http://www.appveyor.com/docs/appveyor-yml
+
+# Don't actually build
+build: off
+
+# Skip tag builds
+skip_tags: true
+
+# Set build version format
+version: "{build}"
+
+# Set up build environment
+environment:
+  # Test against these versions of Node.js
+  matrix:
+    - nodejs_version: "9"
+    - nodejs_version: "8"
+    - nodejs_version: "7"
+    - nodejs_version: "6"
+    - nodejs_version: "5"
+    - nodejs_version: "4"
+
+# Build on both platforms
+platform:
+  - x86
+  - x64
+
+# Install scripts (runs after repo cloning)
+install:
+  # Get the latest version of $env:nodejs_version
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version) $env:platform
+  # Update to latest npm
+  - npm -g install npm 2>&1>nul
+  - SET PATH=%APPDATA%\npm;%PATH%
+  # Output useful info for debugging
+  - node --version
+  - npm --version
+  # Install modules
+  - npm install
+
+# Post-install test scripts
+test_script:
+  # Run module tests
+  - npm test