added appveyor file

appveyor.yml

@@ -0,0 +1,28 @@
+# appveyor file
+# http://www.appveyor.com/docs/appveyor-yml
+
+init:
+  - git config --global core.autocrlf input
+
+# what combinations to test
+environment:
+  matrix:
+    - nodejs_version: 0.10
+    - nodejs_version: 0.8
+    - nodejs_version: 0.11
+
+# combinations having this can fail
+matrix:
+  allow_failures:
+    - nodejs_version: 0.11
+
+install:
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - npm install
+
+build: off
+  
+test_script:
+  - node --version
+  - npm --version
+  - cmd: npm test