complete readme

Author: Nicolas Hart

README.md

@@ -2,4 +2,24 @@
 
 [![Build Status](https://travis-ci.org/Hexanet/swiftmailer-image-embed.svg)](https://travis-ci.org/Hexanet/swiftmailer-image-embed)
 
-Swiftmailer plugin to automatically embed images into message
+Swiftmailer plugin to automatically embed images into message.
+
+## Installation
+
+```
+composer require hexanet/swiftmailer-image-embed
+```
+
+## Usage
+
+```php
+use Hexanet\Swiftmailer\ImageEmbedPlugin;
+
+$mailer = Swift_Mailer::newInstance();
+
+$mailer->registerPlugin(new ImageEmbedPlugin());
+```
+
+## Licence
+
+Swiftmailer Image Embed Plugin is released under the MIT License. See the [bundled LICENSE file](LICENSE) file for details.