My module is not visible in the module list

[dooopa234]

I'm using Prestashop 1.7.5.2.
This is my code:

<?php
if (!defined('_PS_VERSION_')) {
    exit;
}

class plugin extends Module {
    public function __construct()
    {
        $this->name = 'plugin';
        $this->tab = 'front_office_features';
        $this->version = 1.0;
        $this->author = 'Firstname Lastname';
        $this->need_instance = 1;


        $this->displayName = $this->l('Module');
        $this->description = $this->l('ASDFGHJKL');
        parent::__construct();
    }

    public function install()
    {
        if (parent::install() == false) {
            return false;
        }
        return true;
    }
    public function uninstall()
    {
        if (!parent::uninstall()) {
            Db::getInstance()->Execute('DELETE FROM `'._DB_PREFIX_.'mymodule`');
        }
        parent::uninstall();
    }
}
?>

File is named plugin.php and is located in /modules/plugin.

When I open module manager, the module does not appear. In any category.

What am I missing?

Edited March 15, 2019 by dooopa234
Update to current state (see edit history)

[dooopa234]

Solved it. Remember that you need to actually install the plugin under modules -> module -> module catalog and click install

 

[Kogkalidis]

Out of that there is possibility (usually on development stage) that you have some error so the module is being displayed only in directory name.

So if you look for "Module name" instead of "my_module" it's also one occasion where you won't find it.