Add Appveyor CI

appveyor.yml

@@ -0,0 +1,25 @@
+version: "{build}"
+os: Visual Studio 2015
+
+environment:
+  matrix:
+    - generator: Visual Studio 14 2015 Win64
+    - generator: Visual Studio 14 2015
+
+configuration:
+  - Release
+  - Debug
+
+clone_depth: 10
+clone_folder: c:\toml11
+
+build_script:
+  - cd C:\toml11
+  - mkdir build
+  - cd build
+  - git clone https://github.com/toml-lang/toml.git
+  - cmake -G"%generator%" -DBOOST_ROOT=C:/Libraries/boost_1_63_0 ..
+  - cmake --build . --config "%configuration%"
+
+test_script:
+  - ctest --build-config "%configuration%" --timeout 300 --output-on-failure