Add appveyor config

Author: alexcrichton

README.md

@@ -4,6 +4,7 @@ regex
 A Rust library for parsing, compiling, and executing regular expressions.
 
 [![Build Status](https://travis-ci.org/rust-lang/regex.svg?branch=master)](https://travis-ci.org/rust-lang/regex)
+[![Build status](https://ci.appveyor.com/api/projects/status/22g48bo866qr4u77?svg=true)](https://ci.appveyor.com/project/alexcrichton/regex)
 [![](http://meritbadge.herokuapp.com/regex)](https://crates.io/crates/regex)
 
 [Documentation](http://doc.rust-lang.org/regex)

appveyor.yml

@@ -0,0 +1,23 @@
+environment:
+  CARGO_TARGET: x86_64-pc-windows-gnu
+  matrix:
+  - TARGET: x86_64-pc-windows-msvc
+  - TARGET: i686-pc-windows-gnu
+install:
+  - ps: Start-FileDownload "https://static.rust-lang.org/dist/rustc-nightly-${env:TARGET}.tar.gz"
+  - ps: Start-FileDownload "https://static.rust-lang.org/cargo-dist/cargo-nightly-${env:CARGO_TARGET}.tar.gz"
+  - 7z x rustc-nightly-%TARGET%.tar.gz > nul
+  - 7z x rustc-nightly-%TARGET%.tar > nul
+  - 7z x cargo-nightly-%CARGO_TARGET%.tar.gz > nul
+  - 7z x cargo-nightly-%CARGO_TARGET%.tar > nul
+  - call "C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" amd64
+  - set PATH=%PATH%;%cd%/rustc-nightly-%TARGET%/rustc/bin
+  - set PATH=%PATH%;%cd%/cargo-nightly-%CARGO_TARGET%/cargo/bin
+  - SET PATH=%PATH%;C:\MinGW\bin
+  - rustc -V
+  - cargo -V
+
+build: false
+
+test_script:
+  - cargo test --verbose