Add api file and correct README. (#50)

* Add api file and correct README.

* typo.

README.md

@@ -2,14 +2,14 @@
 
 ## Introduction
 
-The Objective Forms module contains a series of functions and classes that allow Drupal forms to be treated as Fedora objects. It provides back-end support to XML Forms so that Drupal's built-in form functions and classes can be used when filling out metadata.
+The Objective Forms module contains a series of functions and classes that allow Drupal forms to be treated as PHP objects. It provides back-end support to XML Forms so that Drupal's built-in form functions and classes can be used when filling out metadata.
 
 Some important notes:
 
 * Each form element is assigned a unique hash Form Property to identify it, as #hash.
 * Each form element that is created is stored in a registry, and it will persist though out the lifetime of the form even if it's removed from the form. Ancestry of Form Elements is stored, so if a Form Element is cloned we will be able to determine the Form Element that is was cloned from.
 * Form Properties can be objects. To define new Form Properties, implement the hook `objectify_properties`.
-* Forms will be auto-populated from `$form_states['values']`.
+* Forms will be auto-populated from `$form_state['values']`.
 * There is a FormStorage class that can be used to store any persistent data.
 
 ## Requirements

objective_forms.api.php

@@ -0,0 +1,28 @@
+<?php
+
+/**
+ * @file
+ * This file documents hooks provided by Objective Forms.
+ */
+
+/**
+ * Define a custom Drupal form property.
+ *
+ * @return array
+ *   Returns an associative array mapping property names to associative
+ *   arrays with all the data required to build a FormProperty class:
+ *   - "type": The type (file extension) of the file to include, e.g. "inc".
+ *   - "module": The machine name of the module where the code is located.
+ *   - "name": The name of the file, including its path within the module.
+ *   - "class": The name of the class defining the property.
+ */
+function hook_objectify_properties() {
+  return array(
+    '#actions' => array(
+      'type' => 'inc',
+      'module' => 'module_name',
+      'file' => 'includes/FileName',
+      'class' => 'ClassName',
+    ),
+  );
+}