Added IcingaCheckUsers and Libraray for users

lib/plugins/Invoke-IcingaCheckUsers.psm1

@@ -1,4 +1,30 @@
+Import-IcingaLib icinga\plugin;
+Import-IcingaLib provider\users;
+
 function Invoke-IcingaCheckUsers()
 {
+    param (
+        [array]$username,
+        [switch]$NoPerfData,
+        $Verbose
 
+    );
+    
+    $UsersPackage  = New-IcingaCheckPackage -Name 'Users' -OperatorAnd -Verbos $Verbose;
+    $UserInformation = Get-IcingaUsers -Username $username;
+
+    foreach ($ExistingUser in $UserInformation) {
+    Write-Host $ExistingUser;
+    If ($null -eq $ExistingUser)
+    {
+        continue;
+    }
+    $Status = $ExistingUser.Enabled;
+
+    $IcingaCheck = New-IcingaCheck -Name ([string]::Format('User {0} Status {1} ', $ExistingUser, $Status)) -Value $Status -NoPerfData;
+    $IcingaCheck.CritIfNotMatch('True') | Out-Null;
+    $UsersPackage.AddCheck($IcingaCheck);
+    }
+    
+    exit (New-IcingaCheckResult -Name 'Users' -Check $UsersPackage -NoPerfData $NoPerfData -Compile);
 }

lib/provider/users/Get-IcingaUsers.psm1

@@ -0,0 +1,18 @@
+function Get-IcingaUsers ()
+{
+    param (
+        [array]$Username
+    );
+
+
+    if ($null -eq $Username) {
+        return Get-LocalUser;
+    } else {
+        [array]$UserInformation
+        foreach ($UniqueUser in $Username) {
+            [array]$UserInformation += Get-LocalUser -Name $UniqueUser;
+        }
+    }
+
+    return $UserInformation;
+}