Merge branch 'feature/readme' into 'master'

feature(readme): readme

See merge request !21

README.md

@@ -18,7 +18,7 @@ It also handles dismiss functionality with AJAX requests.
 
 PHP 5.5 or later.
 
-## Composer
+## Installation with composer
 
 You can install the bindings via [Composer](http://getcomposer.org/). Run the following command:
 
@@ -32,7 +32,7 @@ To use the bindings, use Composer's [autoload](https://getcomposer.org/doc/01-ba
 require_once 'vendor/autoload.php';
 ```
 
-## Manual instalation
+## Manual installation
 
 If you do not wish to use Composer, you can [download the latest release](https://gitlab.com/wpdesk/wp-notice/-/jobs/artifacts/master/download?job=library). Then, to use the Notices, include the init.php file.
 
@@ -42,7 +42,7 @@ require_once('/path/to/wp-desk/wp-notice/init.php');
 
 ## Getting Started
 
-Simple usage looks like:
+### Simple usage looks like
 
 ```php
 $notice = wpdesk_wp_notice('Notice text goes here');
@@ -59,6 +59,26 @@ $notice = new \WPDesk\Notice\Notice('Notice text goes here');
 
 Notice must be used before WordPress action `admin_notices`. WordPress admin actions order is listed [here](https://codex.wordpress.org/Plugin_API/Action_Reference#Actions_Run_During_an_Admin_Page_Request).
 
-## Project documentation
+## Permanent dismissible notices
 
-PHPDoc: https://wpdesk.gitlab.io/wp-notice/index.html 
+### AJAX handler
+
+To use permanent dismissible notices AJAX handler must be created and hooks initialized:
+
+```php
+wpdesk_init_wp_notice_ajax_handler();
+
+// Is equivalent to:
+( new \WPDesk\Notice\AjaxHandler() )->hooks();
+```
+
+### Displaying 
+
+To display permanent dismissible notice:
+
+```php
+wpdesk_permanent_dismissible_wp_notice( 'Notice text goes here', 'notice-name' );
+
+// Is equivalent to
+$notice = new \WPDesk\Notice\PermanentDismissibleNotice( 'Notice text goes here', 'notice-name' );
+```