add git versionning

Author: Miguel Bernard

Directory.Build.props

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PackageReference Include="Nerdbank.GitVersioning">
+      <Version>3.1.91</Version>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>

version.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
+  "version": "1.0-beta",
+  "publicReleaseRefSpec": [
+    "^refs/heads/master$",
+    "^refs/heads/v\\d+(?:\\.\\d+)?$"
+  ],
+  "cloudBuild": {
+    "buildNumber": {
+      "enabled": true
+    }
+  }
+}