Convert 'Init' to MSBuild.

build_projects/dotnet-cli-build/GetCurrentRuntimeInformation.cs

@@ -0,0 +1,27 @@
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+using Microsoft.DotNet.InternalAbstractions;
+
+namespace Microsoft.DotNet.Cli.Build
+{
+    public class GetCurrentRuntimeInformation : Task
+    {
+        [Output]
+        public string Rid { get; set; }
+
+        [Output]
+        public string Architecture { get; set; }
+
+        [Output]
+        public string OSName { get; set; }
+
+        public override bool Execute()
+        {
+            Rid = RuntimeEnvironment.GetRuntimeIdentifier();
+            Architecture = RuntimeEnvironment.RuntimeArchitecture;
+            OSName = Monikers.GetOSShortName();
+
+            return true;
+        }
+    }
+}