👌 IMPROVE: Allow creation of new group

Signed-off-by: Luke Tainton <luke@tainton.uk>

TeamsUserEnroller.psm1

@@ -10,19 +10,32 @@ Function Import-TeamsUsers {
     .PARAMETER File
     The path to the CSV file that contains your users. Can either be an absolute path or relative path.
 
+    .PARAMETER Create
+    If specified, create a new Group first, then add the users from the CSV file.
+
     .EXAMPLE
     Import-TeamsUsers -File "users.csv"
+
+    .EXAMPLE
+    Import-TeamsUsers -Create -File "users.csv"
 #>
 
     Param(
         [parameter(Mandatory=$true, position=1, ParameterSetName='Params', HelpMessage="Specify CSV file")]
-        [string]$File
+        [string]$File,
+        [parameter(Mandatory=$false, position=2, ParameterSetName='Params', HelpMessage="Create new Teams group")]
+        [switch]$Create
     )
 
     Begin {
         $ErrorActionPreference = 'Stop'
         ##### IMPORT CSV FILE #####
+        Try {
             $Users = Import-CSV $File
+        } Catch {
+            Write-Host -ForegroundColor Red "$File is not a valid CSV file."
+        }
+        
 
         ##### CHECK MODULE IS INSTALLED AND IMPORTED #####
         if (Get-Module -ListAvailable -Name MicrosoftTeams) {
@@ -35,6 +48,20 @@ Function Import-TeamsUsers {
     }
 
     Process {
+        If ($Create) {
+            ##### CREATE NEW TEAM #####
+            Clear-Host
+            $NewTeamName = Read-Host -Prompt "Name of the new group"
+            $NewTeamDesc = Read-Host -Prompt "Group description"
+            $NewTeamPriv = Read-Host -Prompt "P[u]blic or P[r]ivate?"
+            If ($NewTeamPriv -Eq "u") {
+                $NewTeamVis = "Public"
+            } Elseif ($NewTeamPriv -Eq "r") {
+                $NewTeamVis = "Private"
+            }
+            $NewTeam = New-Team -DisplayName $NewTeamName -MailNickName $NewTeamName -Description "Testing team creation from PowerShell" -Visibility $NewTeamVis
+            $GroupId = $NewTeam.GroupId
+        } Else {
             ##### GET USER'S TEAMS #####
             Clear-Host
             Write-Host -ForegroundColor Green "Getting your teams - please wait"
@@ -52,6 +79,7 @@ Function Import-TeamsUsers {
             Write-Host "Teams that you own:"
             $EligibleTeams | ForEach-Object {[PSCustomObject]$_} | Format-Table 'GroupId', 'DisplayName' -AutoSize
             $GroupId = Read-Host -Prompt "GroupId of the desired group"
+        }
 
         ##### ENROL USERS #####
         $global:UsersAdded = 0;