add dotnet list p2ps (#4929)

* add stub for dotnet list p2ps

* apply review feedback

* PR feedback: consistent method modifiers

* apply missed review feedback

* add test coverage and do not treat no p2ps as error

* move private methods to the bottom, rename weird res name

src/dotnet/commands/dotnet-list/Program.cs

@@ -0,0 +1,40 @@
+// 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;
+using System.Collections.Generic;
+using Microsoft.DotNet.Tools.List.ProjectToProjectReferences;
+
+namespace Microsoft.DotNet.Tools.List
+{
+    public class ListCommand : DispatchCommand
+    {
+        protected override string HelpText => $@"{LocalizableStrings.ListCommandDescription}
+
+{LocalizableStrings.Usage}: dotnet list [options] <object> <command> [[--] <arg>...]]
+
+Options:
+  -h|--help  {LocalizableStrings.HelpDefinition}
+
+{LocalizableStrings.Arguments}:
+  <object>   {LocalizableStrings.ObjectDefinition}
+  <command>  {LocalizableStrings.CommandDefinition}
+
+{LocalizableStrings.ExtraArgs}:
+  {LocalizableStrings.ExtraArgumentsDefinition}
+
+{LocalizableStrings.Commands}:
+  p2ps       {LocalizableStrings.P2PsDefinition}";
+
+        protected override Dictionary<string, Func<string[], int>> BuiltInCommands => new Dictionary<string, Func<string[], int>>
+        {
+            ["p2ps"] = ListProjectToProjectReferencesCommand.Run,
+        };
+
+        public static int Run(string[] args)
+        {
+            var cmd = new ListCommand();
+            return cmd.Start(args);
+        }
+    }
+}