add row at json view table

examples/view.php

@@ -7,6 +7,10 @@ use Itguild\Tables\ViewJsonTable;
 $json = file_get_contents('view.json');
 
 $table = new ViewJsonTable($json);
+
+$table->addRow("Имя", function (){
+    return "Kirill";
+}, ['after' => 'username']);
 //$table->rows([
 $table->rows([
     'username' => function ($cell) {