Update README to clearify the mediaUrl parameter

README.rst

@@ -0,0 +1,75 @@
+Amazon S3 Adapter for Shopware
+==============================
+
+.. image:: https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square
+   :target: LICENSE.md
+
+The Amazon S3 adapter allows you to manage your media files in shopware on an Amazon S3 account. In addition, you can use Amazon CloudFront for delivering    your files.
+
+Building a package
+------------------
+
+Just run ``./build.sh``.
+
+Install
+-------
+
+Download the plugin from the release page and enable it in shopware.
+
+Usage
+-----
+
+Update your ``config.php`` in your root directory and fill in your own values::
+
+  'cdn' => [
+      'backend' => 's3',
+      'adapters' => [
+          's3' => [
+              'type' => 's3',
+              'mediaUrl' => 'YOUR_S3_OR_CLOUDFRONT_ENDPOINT',
+              'key' => 'YOUR_AWS_KEY',
+              'secret' => 'YOUR_AWS_SECRET',
+              'region' => 'YOUR_S3_REGION',
+              'bucket' => 'YOUR_S3_BUCKET_NAME',
+              'prefix' => ''
+          ]
+      ]
+  ]
+
+
+Value explanation
+-----------------
+
+type (required)
+    Adapter type. Do not change.
+
+mediaUrl (required)
+    URL to access your media files. Usually your S3, CloudFront or custom domain endpoint
+
+    e.g.: ``https://your-bucket-name.s3-website.eu-central-1.amazonaws.com/``
+
+key (required)
+    Your Access Key ID
+
+secret (required)
+    Your Secret Access Key
+
+region (required)
+    The S3 region, e.g. ``eu-central-1``
+
+bucket (required)
+    Your S3 bucket name
+
+prefix
+    An optional path prefix for your media files
+
+endpoint
+    Sets the S3 endpoint specifically (e.g. non-AWS S3)
+
+metaOptions
+    Allows setting options per file specific to `Flysystem S3 Adapter <https://github.com/thephpleague/flysystem-aws-s3-v3/blob/4dea5e457d046b43434824e68e64f45a8dc7eeda/src/AwsS3Adapter.php#L31>`_
+
+License
+-------
+
+The MIT License (MIT). Please see `License File <LICENSE.md>`_ for more information.