Added appveyor build

GitVersion.yml

@@ -0,0 +1,7 @@
+assembly-versioning-scheme: MajorMinorPatch
+mode: ContinuousDelivery
+branches:
+  master:
+    tag: ''
+ignore:
+  sha: []

Hunspell.NetCore.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Hunspell.NetCore", "src\Hun
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{312E1AA7-E8A4-4AEB-8D9D-6327A0ED57FB}"
 	ProjectSection(SolutionItems) = preProject
+		appveyor.yml = appveyor.yml
+		GitVersion.yml = GitVersion.yml
 		SharedAssemblyInfo.cs = SharedAssemblyInfo.cs
 	EndProjectSection
 EndProject

appveyor.yml

@@ -0,0 +1,24 @@
+configuration: Release
+platform: Any CPU
+
+install:
+  - choco install gitversion.portable -pre -y
+
+assembly_info:
+  patch: false
+
+before_build:
+  - nuget restore
+  - ps: gitversion /l console /output buildserver /updateAssemblyInfo SharedAssemblyInfo.cs
+  - ps: |
+      $jsonpath = 'src/Hunspell.NetCore/project.json'
+      $json = Get-Content -Raw -Path $jsonpath | ConvertFrom-Json
+      $json.version = $Env:GitVersion_NuGetVersion
+      $json | ConvertTo-Json -depth 999 | Out-File $jsonpath
+
+build:
+  project: Hunspell.NetCore.sln
+
+after_build:
+  - cmd: dotnet pack src/Hunspell.NetCore -c Release
+  - cmd: appveyor PushArtifact "src/Hunspell.NetCore/bin/Release/Hunspell.NetCore.%GitVersion_NuGetVersion%.nupkg"