Add .appveyor.yml

.appveyor.yml

@@ -0,0 +1,33 @@
+environment:
+  matrix:
+  - TARGET: x86_64-pc-windows-msvc
+    CHANNEL: nightly
+  - TARGET: x86_64-pc-windows-msvc
+    CHANNEL: stable
+  - TARGET: x86_64-pc-windows-msvc
+    CHANNEL: 1.24.1
+  - TARGET: x86_64-pc-windows-gnu
+    CHANNEL: stable
+  - TARGET: i686-pc-windows-msvc
+    CHANNEL: nightly
+  - TARGET: i686-pc-windows-gnu
+    CHANNEL: nightly
+
+install:
+  - ps: >-
+        If ($Env:TARGET -eq 'x86_64-pc-windows-gnu') {
+          $Env:PATH += ';C:\msys64\mingw64\bin'
+        } ElseIf ($Env:TARGET -eq 'i686-pc-windows-gnu') {
+          $Env:PATH += ';C:\MinGW\bin'
+        }
+  - appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - rustup-init -yv --default-toolchain %CHANNEL% --default-host %TARGET%
+  - SET PATH=%PATH%;%USERPROFILE%\.cargo\bin
+  - rustc -vV
+  - cargo -vV
+
+build: false
+
+test_script:
+  - cargo build --verbose
+  - cargo test --verbose