module configuration form Drupal 7

custom.module.php

  function HOOK_menu(){
        $items = [];
  $items['admin/config/content/HOOK_custom'] = array(
    'title' => 'Meta tags',
    'description' => 'Configuration for Meta tags module',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('HOOK_custom_form'),
    'access arguments' => array('access administration pages'),
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
  }


function HOOK_custom_form($form, &$form_state) {
  $form['HOOK_custom_meta_desc'] = array(
    '#type' => 'textarea',
    '#title' => t('Meta tag: Description'),
    '#default_value' => variable_get('HOOK_custom_meta_desc', ""),
    '#description' => t('Meata description for home page'),
    '#required' => FALSE,
  );

  return system_settings_form($form);
}

HOOK_custom.info

name =  Custom
description = 
core = 7.x
package = TNM Custom
configure = admin/config/content/HOOK_custom