test project - almost finished - not all review changes included

test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/AddP2PCommand.cs

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+// 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 Microsoft.DotNet.Cli.Utils;
+
+namespace Microsoft.DotNet.Tools.Test.Utilities
+{
+    public sealed class AddP2PCommand : TestCommand
+    {
+        private string _projectName = null;
+
+        public AddP2PCommand()
+            : base("dotnet")
+        {
+
+        }
+
+        public override CommandResult Execute(string args = "")
+        {
+            args = $"add {_projectName} p2p {args}";
+            return base.ExecuteWithCapturedOutput(args);
+        }
+
+        public AddP2PCommand WithProject(string projectName)
+        {
+            _projectName = projectName;
+            return this;
+        }
+    }
+}