update readme

README.md

@@ -1,6 +1,73 @@
 # twister-php
+
 PHP 8 / Composer Tools for Twister API
 
 ## Install
 
 `composer require twisterarmy/twister`
+
+## Features
+
+### Client
+
+Twister client communication toolkit
+
+### RSS
+
+RSS toolkit for twister
+
+###### Init
+
+```
+$rss = new \Twisterarmy\Twister\Rss();
+```
+
+#### Format
+
+##### Time
+
+Convert RSS time to datetime format ([Documentation](`https://www.php.net/manual/en/datetime.format.php`))
+
+###### Example
+
+```
+$rss->setTimeFormat('c');
+```
+
+##### Message
+
+Convert RSS fields to twister message format
+
+###### Mask
+
+* `{time}` - formatted time string by `setTimeFormat`, `U` by default
+* `{link}` - target link
+* `{title}` - item title
+
+###### Example
+
+```
+$rss->setMessageFormat('{title} {link}');
+```
+
+#### Length
+
+Twister protocol accept messages with 256 chars max but you can define another value.
+
+Formatted messages greater this value will be skipped from feed.
+
+##### Example
+
+```
+$rss->setLength(256);
+```
+
+#### Feed
+
+Get formatted feed array
+
+##### Example
+
+```
+$feed = $rss->get(url);
+```