Build in AppVeyor. (#20)

appveyor.yml

@@ -0,0 +1,30 @@
+image: Visual Studio 2017
+
+init:
+  - git config --global core.autocrlf true
+
+branches:
+  only:
+    - master
+
+platform: Any CPU
+
+configuration:
+  - Release
+
+build_script:
+  - dotnet build src\Everything.sln
+
+test:
+  assemblies: '**\*.UnitTests.dll'
+
+notifications:
+  - provider: Email
+    to:
+     - vsarcplat@microsoft.com
+    subject: '{{projectName}} Build {{status}}: Version: {{buildVersion}}'
+    on_build_status_changed: true
+
+cache:
+  - packages -> **\packages.config
+  - '%LocalAppData%\NuGet\Cache'

src/build/New-VersionConstantsFile.ps1

@@ -34,4 +34,8 @@ namespace $namespace
 
 $outputFile = "$outputDirectory\VersionConstants.cs"
 
+if (-not (Test-Path $outputDirectory)) {
+    New-Item -Type Directory $outputDirectory | Out-Null
+}
+
 Set-Content $outputFile $versionConstantsFileContents