#7 Added Appveyor CI configuration (#24)

* Create appveyor.yml

* Setup deploys to nuget.org feed, github release; use gitversion output to proper tag appvoyer build, github release, github tag

appveyor.yml

@@ -0,0 +1,57 @@
+version: '{build}'
+pull_requests:
+  do_not_increment_build_number: true
+branches:
+  only:
+  - master
+  - develop
+skip_tags: true
+environment:
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: true
+  VERSION_INFO_SEMVER: null
+  VERSION_INFO: null
+install:
+- ps: >-
+    $version_info = (gitversion /output json | ConvertFrom-Json)
+
+    $env:VERSION_INFO = $version_info
+
+    $env:VERSION_INFO_SEMVER = $version_info.SemVer
+
+
+    Update-AppveyorBuild -Version "$env:VERSION_INFO_SEMVER-$env:APPVEYOR_BUILD_NUMBER"
+
+
+    Write-Host "Set VERSION_INFO_SEMVER = " $env:VERSION_INFO_SEMVER
+
+    Write-Host "Set APPVEYOR_BUILD_VERSION = " $env:APPVEYOR_BUILD_VERSION
+nuget:
+  project_feed: true
+  disable_publish_on_pr: true
+build_script:
+- ps: .\build.ps1
+test: off
+artifacts:
+- path: .\artifacts\*.nupkg
+  name: NuGet
+- path: .\test-results\*.xml
+  name: Xunit
+
+deploy:
+- provider: GitHub
+  tag: ${VERSION_INFO_SEMVER}
+  release: v${VERSION_INFO_SEMVER}
+  auth_token:
+    secure: xB9HMo4bYJ5YAcDMG/vm019T6A6BrWvq0W538SZ7KD4M+VTwYKKYF+QSnQw1AIg4
+  artifact: nothing
+  draft: true
+  on:
+    branch: master
+- provider: NuGet
+  api_key:
+    secure: IfXB68vXuUlPe+R9b6siviwC8H4UlhCAAHD8UR4JjUVur8melAN/AHwxttr2Ct9N0DV0My65NQdxa6iwm1MoYlw6qMi60oi+wbTIdhAChT4=
+  skip_symbols: true
+  artifact: NuGet
+  on:
+    branch: master