groups for resources

app/Filament/Resources/Belts/BeltResource.php

@@ -14,12 +14,14 @@ use Filament\Resources\Resource;
 use Filament\Schemas\Schema;
 use Filament\Support\Icons\Heroicon;
 use Filament\Tables\Table;
+use UnitEnum;
 
 class BeltResource extends Resource
 {
     protected static ?string $model = Belt::class;
 
     protected static string|BackedEnum|null $navigationIcon = Heroicon::ArrowUpCircle;
+    protected static string | UnitEnum | null $navigationGroup = 'Kurse und Kinder';
 
     protected static ?string $recordTitleAttribute = 'name';