Add appveyor configuration file

appveyor.yml

@@ -0,0 +1,19 @@
+environment:
+  TARGET: x86_64-pc-windows-msvc
+install:
+  - ps: Start-FileDownload "https://static.rust-lang.org/dist/rust-nightly-${env:TARGET}.exe"
+  - rust-nightly-%TARGET%.exe /VERYSILENT /NORESTART /DIR="C:\Program Files (x86)\Rust"
+  - SET PATH=%PATH%;C:\Program Files (x86)\Rust\bin
+  - rustc -V
+  - cargo -V
+  - ps: Start-FileDownload 'http://sqlite.org/2015/sqlite-dll-win64-x64-3090200.zip'
+  - cmd: 7z e sqlite-dll-win64-x64-3090200.zip -y > nul
+
+build: false
+
+test_script:
+  - cargo test
+
+branches:
+  only:
+    - appveyor