Provide commands to get Blazor template options (#17906)

Author: guardrex

aspnetcore/blazor/templates.md

@@ -5,7 +5,7 @@ description: Learn about ASP.NET Core Blazor app templates and Blazor project st
 monikerRange: '>= aspnetcore-3.1'
 ms.author: riande
 ms.custom: mvc
-ms.date: 03/26/2020
+ms.date: 04/19/2020
 no-loc: [Blazor, SignalR]
 uid: blazor/templates
 ---
@@ -24,6 +24,13 @@ For more information on Blazor's hosting models, see <xref:blazor/hosting-models
 
 For step-by-step instructions on creating a Blazor app from a template, see <xref:blazor/get-started>.
 
+Template options are available by passing the `--help` option to the [dotnet new](/dotnet/core/tools/dotnet-new) CLI command:
+
+```dotnetcli
+dotnet new blazorwasm --help
+dotnet new blazorserver --help
+```
+
 ## Blazor project structure
 
 The following files and folders make up a Blazor app generated from a Blazor template: