Added appveyor.yml

Author: adriangodong

appveyor.yml

@@ -0,0 +1,18 @@
+version: '{build}'
+image: Visual Studio 2017
+configuration: Release
+before_build:
+- cmd: dotnet restore
+build:
+  project: MediumSdk.sln
+test_script:
+  - cmd: dotnet test Medium.Tests/Medium.Tests.csproj
+artifacts:
+- path: '**/*.nupkg'
+  name: Nuget Packages
+deploy:
+- provider: NuGet
+  api_key:
+    secure: y7n963kT1eor3dpj742k0mwnMPXsWGnljEGlfUr2zaGgqtMOJ4OegiWmLctuGYlY
+  on:
+    branch: master