feat(test): add appveyor

.appveyor.yml

@@ -0,0 +1,11 @@
+install:
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - if not defined RUSTFLAGS rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain nightly
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustc -V
+  - cargo -V
+
+build: false
+
+test_script:
+  - cargo test

README.md

@@ -2,6 +2,7 @@
 > pack up the wasm and publish it to npm!
 
 [![Build Status](https://travis-ci.org/ashleygwilliams/wasm-pack.svg?branch=master)](https://travis-ci.org/ashleygwilliams/wasm-pack)
+[![Build status](https://ci.appveyor.com/api/projects/status/7jjuo5wewu9lyyfi?svg=true)](https://ci.appveyor.com/project/ashleygwilliams/wasm-pack)
 
 the goal of this project is to create a portable command line tool
 for publishing compiled wasm projects to the npm registry for the consumption