Create Magento 2 Module (Basic) Part I

here my first step to understanding magento 2 module development by create hello world extension, haha:

1. create file app/code/Ansyori/HelloWorld/etc/module.xml
2. here module.xml file content

   <?xml version="1.0"?>
   <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
       <module name="Ansyori_HelloWorld" setup_version="0.0.0">
       </module>
   </config>

3. then create module registration file,  app/code/Ansyori/HelloWorld/registration.php

4. <?php
   \Magento\Framework\Component\ComponentRegistrar::register(
       \Magento\Framework\Component\ComponentRegistrar::MODULE,
       'Ansyori_HelloWorld',
       __DIR__
   );
   ?>

5. run follwing command use shell/command promp
6. “php D:\xampp\htdocs\magento21\bin\magento setup:upgrade”
7. or “D:\xampp\php\php  D:\xampp\htdocs\magento21\bin\magento setup:upgrade”
8. if still not work, go to app\etc\config.php, edit the file

9. <?php
   return array (
     'modules' => 
     array (
       'Ansyori_HelloWorld' => 1, 
       'Magento_Store' => 1,
       .............

10. clear magento cache, at System->Cache Managements->Flush Magento Cache
11. you will see your new module listed at Store->Setting->Configuration->Advanced->Advanced