(#208) Improve UX of Crescendo cmdlets

This commit begins the work of improving the author experience when
accelerating a native command.

This commit exposes all properties off the Command class to the user
via the New-CrescendoCommand cmdlet. Further to exposing all available
properties, an ArgumentCompleter attribute has been introduced to the
Verb parameter to allow for tab completion of PowerShell built-in
approved verbs.

Author: steviecoaster

Microsoft.PowerShell.Crescendo/src/Microsoft.PowerShell.Crescendo.psm1

@@ -233,7 +233,7 @@ class Command {
     Command() {
         $this.Platform = "Windows","Linux","MacOS"
     }
-    Command([string]$Verb, [string]$Noun)
+    Command([string]$Verb, [string]$Noun,[string]$OriginalName,$Description)
     {
         $this.Verb = $Verb
         $this.Noun = $Noun
@@ -681,13 +681,95 @@ function New-OutputHandler {
 function New-CrescendoCommand {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions","")]
     param (
-        [Parameter(Position=0,Mandatory=$true)][string]$Verb,
-        [Parameter(Position=1,Mandatory=$true)][string]$Noun,
-        [Parameter(Position=2)][string]$OriginalName
+        [Parameter(Position=0,Mandatory=$true)]
+        [ArgumentCompleter( {
+            param ( $commandName,
+                    $parameterName,
+                    $wordToComplete,
+                    $commandAst,
+                    $fakeBoundParameters )
+                    if ($WordToComplete) {
+                        (Get-Verb).Verb | Where-Object { $_ -match "^$WordToComplete"}
+                    } 
+    
+                    else {
+                        (Get-Verb).Verb
+                    }
+        } )]
+        [string]
+        $Verb,
+
+        [Parameter(Position=1,Mandatory=$true)]
+        [string]
+        $Noun,
+
+        [Parameter(Position=2)]
+        [string]
+        $OriginalName,
+
+        [Parameter(Position=3)]
+        [string]
+        $Description,
+
+        [Parameter()]
+        [string[]]
+        $Aliases,
+
+        [Parameter()]
+        [string] $DefaultParameterSetName,
+
+        [Parameter()]
+        [bool] 
+        $SupportsShouldProcess,
+
+        [Parameter()]
+        [string] 
+        $ConfirmImpact,
+
+        [Parameter()]
+        [bool] 
+        $SupportsTransactions,
+
+        [Parameter()]
+        [bool]
+        $NoInvocation,
+         # certain scenarios want to use the generated code as a front end. When true, the generated code will return the arguments only.
+        [Parameter()]
+        [UsageInfo]
+        $Usage,
+
+        [Parameter()]
+        [List[ParameterInfo]]
+        $Parameters,
+
+        [Parameter()]
+        [List[ExampleInfo]]
+        $Examples,
+
+        [Parameter()]
+        [string]
+        $OriginalText,
+
+        [Parameter()]
+        [string[]]
+        $HelpLinks,
+    
+        [Parameter()]
+        [OutputHandler[]]
+        $OutputHandlers
+    
+
+
     )
-    $cmd = [Command]::new($Verb, $Noun)
-    $cmd.OriginalName = $OriginalName
+
+    $cmd = [Command]::new($Verb, $Noun,$OriginalName,$Description)
+    
+    $PSBoundParameters.GetEnumerator() |
+    ForEach-Object {
+        $cmd.$($psitem.Key) = $PSItem.Value
+    }
     $cmd
+
 }
 
 function Export-CrescendoCommand {