Migrated the project to dotnet core 3.0

src/version.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://raw.githubusercontent.com/AArnott/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
+  "version": "1.0.9",
+  "publicReleaseRefSpec": [
+    ".*/master$" // we release out of master
+  ],
+  "nugetPackageVersion": {
+     "semVer": 2 // optional. Set to either 1 or 2 to control how the NuGet package version string is generated. Default is 1.
+  },
+  "cloudBuild": {
+    "setVersionVariables": true,
+    "buildNumber": {
+      "enabled": true,
+      "includeCommitId": {
+        "when": "nonPublicReleaseOnly",
+        "where": "buildMetadata"
+      }
+    }
+  },
+  "inherit": false
+}