Add Portable Test Package Asset

TestAssets/TestPackages/dotnet-portable/Program.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace ConsoleApplication
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            Console.WriteLine("Hello Portable World!");
+        }
+    }
+}

TestAssets/TestPackages/dotnet-portable/project.json

@@ -0,0 +1,18 @@
+{
+  "version": "1.0.0",
+  "compilationOptions": {
+    "emitEntryPoint": true
+  },
+  
+  "frameworks": {
+    "netstandard1.5": {
+      "imports": [
+        "dnxcore50",
+        "portable-net45+win8"
+      ],
+      "dependencies": {
+        "Microsoft.NETCore.App": "1.0.0-rc2-23911"
+      }
+    }
+  }
+}