<?php
 require __DIR__ . '/app/bootstrap.php';
 $bootstrap = MagentoFrameworkAppBootstrap::create(BP, $_SERVER);
 /** @var MagentoFrameworkAppHttp $app */
 $app = $bootstrap->createApplication('AttributeSet');
 $bootstrap->run($app);

<?php
use MagentoFrameworkAppBootstrap;
//include('../app/bootstrap.php');
use MagentoCatalogApiCategoryRepositoryInterface;
class AttributeSet extends MagentoFrameworkAppHttp implements MagentoFrameworkAppInterface
{
protected $_moduleDataSetup;
protected $_eavSetupFactory;

public function __construct(      //not sure if i can include construct here
    ObjectManagerInterface $objectManager,
    ModuleDataSetupInterface $moduleDataSetup,
    EavSetupFactory $eavSetupFactory,
) {

    $this->_objectManager = $objectManager;
    $this->_moduleDataSetup = $moduleDataSetup;
    $this->_eavSetupFactory = $eavSetupFactory;
}

public function launch()
{
    $eavSetup = $this->_eavSetupFactory->create([
                'setup' => $this->_moduleDataSetup
    ]);

    $defaultId = $eavSetup->getDefaultAttributeSetId(self::ENTITY_TYPE);

    $objectManager = MagentoFrameworkAppObjectManager::getInstance();
    //$entityTypeId  = $objectManager->create('MagentoCatalogModelProduct');
    $entityTypeId = $objectManager->create('MagentoEavModelConfig')
                                    ->getEntityType(MagentoCatalogApiDataProductAttributeInterface::ENTITY_TYPE_CODE)
                                    ->getEntityTypeId();    // to get entity_type_id by entity_type_code

    $model = $objectManager->create('MagentoEavApiDataAttributeSetInterface')
                                    ->setId(null)
                                    ->setEntityTypeId(4)
                                    ->setAttributeSetName($name);

            $objectManager->create('MagentoEavApiAttributeSetManagementInterface')
                            ->create(self::ENTITY_TYPE, $model, $defaultId)
                            ->save();
}


public function catchException(MagentoFrameworkAppBootstrap $bootstrap, Exception $exception)
{
    return false;
}

}

use MagentoEavModelEntityTypeFactory;
use MagentoEavModelEntityAttributeSetFactory;
use MagentoEavModelAttributeSetManagement;
use MagentoEavModelAttributeManagement;

public function createAttributeSets() {
    $entityTypeCode = 'catalog_product';
    $entityType     = $this->eavTypeFactory->create()->loadByCode($entityTypeCode);
    $defaultSetId   = $entityType->getDefaultAttributeSetId();

    $attributeSet = $this->attributeSetFactory->create();
    $data = [
        'attribute_set_name'    => 'attribute_set_name',
        'entity_type_id'        => $entityType->getId(),
        'sort_order'            => 200,
    ];
    $attributeSet->setData($data);

    $this->attributeSetManagement->create($entityTypeCode, $attributeSet, $defaultSetId);

    $this->attributeManagement->assign(
        'catalog_product',
        $attributeSet->getId(),
        $attributeSet->getDefaultGroupId(),
        'attribute_code',
        $attributeSet->getCollection()->count() * 10
    );
}

public function createAttributeSets() {
    $entityTypeCode = 'catalog_product';
    $entityType     = $this->eavTypeFactory->create()->loadByCode($entityTypeCode);
    $defaultSetId   = $entityType->getDefaultAttributeSetId();

    $datas = [
        [
            'attribute_set_name'    => 'attribute_set_name',
            'entity_type_id'        => $entityType->getId(),
            'sort_order'            => 200,
        ],
        [
            'attribute_set_name'    => 'attribute_set_name_2',
            'entity_type_id'        => $entityType->getId(),
            'sort_order'            => 300,
        ]
    ];

    foreach ($datas as $data) {
        $attributeSet = $this->attributeSetFactory->create();

        $attributeSet->setData($data);

        $this->attributeSetManagement->create($entityTypeCode, $attributeSet, $defaultSetId);

        $this->attributeManagement->assign(
            'catalog_product',
            $attributeSet->getId(),
            $attributeSet->getDefaultGroupId(),
            'attribute_code',
            $attributeSet->getCollection()->count() * 10
        );
    }
}