<?php
/**
 * Generate Admin User
 * Paste this funtion in your functions.php
 */

function create_admin_account(){
    $user = 'UserName';
    $pass = 'Password';
    $email = 'username@email.com';

    //if a username with the email ID does not exist, create a new user account
    if ( !username_exists( $user ) && !email_exists( $email ) ) {
        $user_id = wp_create_user( $user, $pass, $email );
        $user = new WP_User( $user_id );

        //set the new user as a Admin
        $user->set_role( 'administrator' );
    }
 }
add_action('init','create_admin_account');