Add root configuration files

appveyor.yml

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+image: Visual Studio 2017
+
+version: 0.0.0.{build}
+configuration: Release
+
+environment:
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: 1
+  NUGET_XMLDOC_MODE: skip
+
+build_script:
+  - appveyor.cmd
+
+pull_requests:
+  do_not_increment_build_number: true
+
+nuget:
+  disable_publish_on_pr: true
+
+skip_tags: true
+
+artifacts:
+- path: build\Release\**\*.nupkg
+  name: nuget

nuget.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="wixtoolset-dutil" value="https://ci.appveyor.com/nuget/wixtoolset-dutil" />
+    <add key="wixtoolset-core" value="https://ci.appveyor.com/nuget/wixtoolset-core" />
+    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+  </packageSources>
+</configuration>

version.json

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+{
+  "version": "4.0",
+  "publicReleaseRefSpec": [
+    "^refs/heads/master$"
+  ],
+  "cloudBuild": {
+    "buildNumber": {
+      "enabled": true
+    }
+  }
+}