Add deprecation message to AddAzureASAccount cmdlet.

Author: gapreste

src/AnalysisServices/AnalysisServices.Dataplane/Commands/AddAzureASAccount.cs

@@ -23,12 +23,14 @@
 using Microsoft.Azure.Commands.Common.Authentication.Abstractions;
 using Microsoft.WindowsAzure.Commands.Common;
 using System;
+using Microsoft.WindowsAzure.Commands.Common.CustomAttributes;
 
 namespace Microsoft.Azure.Commands.AnalysisServices.Dataplane
 {
     /// <summary>
     /// Cmdlet to log into an Analysis Services environment
     /// </summary>
+    [CmdletDeprecation("2.0.0")]
     [Cmdlet("Add", ResourceManager.Common.AzureRMConstants.AzurePrefix + "AnalysisServicesAccount", DefaultParameterSetName = "UserParameterSetName", SupportsShouldProcess =true)]
     [Alias("Login-AzureAsAccount", "Login-AzAsAccount")]
     [OutputType(typeof(AsAzureProfile))]