[Apps] Add Get-MobileApp

Scenario Modules/Apps/Apps.psm1

@@ -0,0 +1,14 @@
+function Get-MobileApp {
+    [CmdletBinding(DefaultParameterSetName='__AllParameterSets')]
+    param(
+        [Parameter(Mandatory, ValueFromPipelineByPropertyName, ParameterSetName='GetSingleApp')]
+        [ValidateNotNullOrEmpty()]
+        [string]$mobileAppId
+    )
+
+    if ($PSCmdlet.ParameterSetName -eq 'GetSingleApp') {
+        Get-DeviceAppManagement_MobileApps -mobileAppId $mobileAppId
+    } else {
+        Get-DeviceAppManagement_MobileApps | Get-MSGraphAllPages
+    }
+}