Update README

README.md

@@ -75,8 +75,17 @@ $ffmpeg = FFMpeg\FFMpeg::create(array(
 
 ### Manipulate media
 
-`FFMpeg\FFMpeg` creates media based on file paths. To open a file path, use the
-`FFMpeg\FFMpeg::open` method.
+`FFMpeg\FFMpeg` creates media based on URIs. URIs could be either a pointer to a
+local filesystem resource, an HTTP resource or any resource supported by FFmpeg.
+
+**Note** : To list all supported resource type of your FFmpeg build, use the
+`-protocols` command :
+
+```
+ffmpeg -protocols
+```
+
+To open a resource, use the `FFMpeg\FFMpeg::open` method.
 
 ```php
 $ffmpeg->open('video.mpeg');
@@ -145,6 +154,20 @@ $video
     ->synchronize();
 ```
 
+###### Rotate
+
+Rotates a video to a given angle.
+
+```php
+$video->filters()->rotate($angle);
+```
+
+The `$angle` parameter must be one of the following constants :
+
+- `FFMpeg\Filters\Video\RotateFilter::ROTATE_90` : 90° clockwise
+- `FFMpeg\Filters\Video\RotateFilter::ROTATE_180` : 180°
+- `FFMpeg\Filters\Video\RotateFilter::ROTATE_270` : 90° counterclockwise
+
 ###### Resize
 
 Resizes a video to a given size.