developer_docs.module

<?php


function developer_docs_admin() {
  $form = array();

  $form['developer_docs_desc'] = array(
    '#type' => 'textarea',
    '#title' => t('Notes about your system'),
    '#default_value' => variable_get('developer_docs_desc', ''),
    '#size' => 200,
    '#maxlength' => 20000,
    '#description' => t("Describe the things that the next developer needs to know to get up and running quickly"),
    '#required' => TRUE,
  );

  return system_settings_form($form);
}

function developer_docs_menu() {

  $items = array();

  $items['admin/settings/developer_docs'] = array(
    'title' => 'Developer Documentation',
    'description' => 'This page is where you centralize your Drupal system documentation',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('developer_docs_admin'),
    'access arguments' => array('administer developer_docs settings'),
    'type' => MENU_NORMAL_ITEM,
   );

  return $items;
}