Update README.md

README.md

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 The repository plugin serves as a way to embed videos of your Opencast system into a Moodle course.
 It is one of multiple plugins integrating Opencast with Moodle.
 
-**Requirements**
+## Documentation ##
 
-- [tool_opencast](https://github.com/Opencast-Moodle/moodle-tool_opencast)
-- Recommended: [block_opencast](https://github.com/Opencast-Moodle/moodle-block_opencast)
-- Optional: [filter_opencast](https://github.com/Opencast-Moodle/moodle-filter_opencast)
-
-**Usage**
-
-The plugin allows teachers to embed Opencast videos into a course.
-The repository displays all videos that belong to the Opencast series that are connected to the course.
-
-![image](https://user-images.githubusercontent.com/9437254/50089314-caadf180-0205-11e9-93f9-6a7d3f1f6726.png)
-
-The connection, which Opencast series belong to which Moodle course, is usually done using [block_opencast](https://github.com/Opencast-Moodle/moodle-block_opencast).
-
-The repository is only available within a text editor and will paste the URL to the resource into the content.
-This URL will later be replaced via a Moodle filter to show an embedded player.
-There are two different possibilities:
-
-* **Display a video using the Moodle media filter:**
-
-    The repository can embed a link to the media file of the Opencast event.
-    This link will automatically be replaced by the Moodle media filter.
-    Be aware that by default Opencast does not protect links to published files in any way.
-    Thus, this link can be easily shared between students, who might not have access to the course itself.
-
-* **Display a video using an Opencast player:**
-
-    The repository can paste a link to the course content, which leads to a page at which an embeddable Opencast player is provided.
-    For this scenario, you will need the [filter_opencast](https://github.com/Opencast-Moodle/moodle-filter_opencast) plugin.
-    The filter will replace the link by an iFrame, which displays the Opencast player.
-    In order for this to work, the selected publication channel of the repository instance has to serve the URL to the player within the publication URL.
-
-**Configuration (multiple instances and publication channel)**
-
-Opencast publishes its events in so called publication channels.
-Two default publication channels are e.g. the `api` and the `engage-player` channels.
-Each publication has a publication URL, which points to the page under which the video is published (e.g. an HTTP page with the Opencast player).
-Additionally, publications can contain a set of media data with URLs to the media files themselves (e.g. an MP4 file).
-
-The Moodle administrator can create multiple Opencast repository instances.
-Each of these repositories has two important options:
-
-* **Opencast channel ID:** The publication channel ID given here, determines which videos are available in the repository.
-Only those videos are listed, which are published under the respective channel.
-Additionally, the channel can determine, how the video is displayed. Depending on the publication URL, the video could for instance be displayed using the Paella or the Theodul player.
-
-* **Embedd URL to player instead of media file:** This flag determines, if the repository will paste a link to the publication URL or to a media file in the text editor.
-
-The other configuration options concerning flavors steer, which thumbnail should be used within the filepicker or which media file flavor is preferred, when media files are embedded directly.
+The full documentation of the plugin can be found [here](https://moodle.docs.opencast.org/#repository/about/).