1. Create a info.yml file
Here : test.info.yml

name: 'Test Module'
description: 'Test module for Drupal8.ovh'
type: module
core: 8.x
varsion: 0.1-dev
package: Test
   

    Here an example for create a user account programmatically in Drupal 8

    $language = \Drupal::languageManager()->getCurrentLanguage()->getId();
    $user = \Drupal\user\Entity\User::create();

Module name : Test

Step 1. Create the module folder on module/custom directory
Exemple : module/custom/test

Here an example for create node programmatically in Drupal 8

Drupal 8

//To get the lanuage code:
$language = \Drupal::languageManager()->getCurrentLanguage()->getId();

//To get the language name:
$language =  \Drupal::languageManager()->getCurrentLanguage()->getName();