Add appveyor config file

.appveyor.yml

@@ -0,0 +1,38 @@
+version: '{build}-{branch}'
+
+os: 'Visual Studio 2015'
+
+environment:
+  matrix:
+    - ARCH: x64
+      MSYS2_ARCH: x86_64
+      MSYS2_DIR: msys64
+      MSYSTEM: MINGW64
+      GOPATH: c:\gopath
+      GOARCH: amd64
+      CGO_ENABLED: 1
+    - ARCH: x86
+      MSYS2_ARCH: i686
+      MSYS2_DIR: msys64
+      MSYSTEM: MINGW32
+      GOPATH: c:\gopath
+      GOARCH: 386
+      CGO_ENABLED: 1
+
+branches:
+  only:
+    - master
+
+clone_folder: C:\gopath\src\github.com\square\ghostunnel
+
+before_build:
+  # Go paths
+  - set PATH=C:\go19\bin;C:\%GOPATH%\bin;%PATH%
+  # MSYS paths
+  - set PATH=C:\%MSYS2_DIR%\%MSYSTEM%\bin;C:\%MSYS2_DIR%\usr\bin;%PATH%
+  # Install build deps
+  - bash -lc "for n in `seq 1 3`; do pacman --noconfirm -Syyuu && break || sleep 15; done"
+  - bash -lc "for n in `seq 1 3`; do pacman --noconfirm -S mingw-w64-%MSYS2_ARCH%-libtool && break || sleep 15; done"
+
+build_script:
+  - go build -o ghostunnel.exe -i .