Add AppVeyor and GitVersion configuration

GitVersion.yml

@@ -0,0 +1,17 @@
+assembly-informational-format: '{NuGetVersion}'
+mode: ContinuousDeployment
+branches:
+  master:
+    tag: rc
+    increment: Minor
+  features?[/-]:
+    tag: rc-{BranchName}
+    increment: Minor
+  (pull|pull\-requests|pr)[/-]:
+    tag: rc-pr-{BranchName}
+    increment: Minor
+  hotfix(es)?[/-]:
+    tag: rc
+    increment: Patch
+  dev(elop)?(ment)?$:
+    tag: b

appveyor.yml

@@ -0,0 +1,13 @@
+image: Visual Studio 2017
+configuration: Release
+install:
+  - choco install gitversion.portable -y
+before_build:
+  - cmd: gitversion /l console /output buildserver /b %APPVEYOR_REPO_BRANCH%
+  - nuget restore
+build_script:
+  msbuild /nologo /v:m /p:AssemblyVersion=%GitVersion_AssemblySemVer% /p:FileVersion=%GitVersion_MajorMinorPatch% /p:InformationalVersion=%GitVersion_InformationalVersion% /p:Configuration=%CONFIGURATION% S7.sln
+after_build:
+  - dotnet pack S7.Net -c %CONFIGURATION% /p:Version=%GitVersion_NuGetVersion% --no-build -o ..\artifacts
+artifacts:
+  - path: artifacts\*.*