Update launch settings for ApplicationUrl handling

TestAssets/TestProjects/AppWithApplicationUrlInLaunchSettings/Program.cs

@@ -0,0 +1,16 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using System;
+
+namespace MSBuildTestApp
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            var message = Environment.GetEnvironmentVariable("ASPNETCORE_URLS");
+            Console.WriteLine(message);
+        }
+    }
+}