created first draft of a custom mount configuration GUI documentation.

admin_manual/configuration/custom_mount_config_gui.rst

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+Custom Mount Configuration Web-GUI
+==================================
+
+Since ownCloud 5.0 it is possible to mount external storage providers into
+ownCloud's virtual file system. To add an external storage backend to your
+ownCloud head to Settings -> Admin or Personal. As an administrator you can
+mount external storage for any group or user. Users are also allowed to mount
+external storage for their selves if this setting has been enabled by the
+administrator.
+
+custom_mount_config_gui-1.png
+
+At first you have to enter the mount point, this is the directory that the
+storage will be mounted to. Then you select the storage backend from the list
+of supported backends. As of writing ownCloud currently supports the following
+storage backends:
+
+custom_mount_config_gui-2.png
+
+-  Local file system (mount storage that is outside your ownCloud’s data directory)
+-  FTP (or FTPS)
+-  SFTP
+-  SMB
+-  WebDAV
+-  `Amazon S3`_
+-  `Dropbox`_
+-  `Google Drive`_
+-  `OpenStack Swift`_
+
+Please keep in mind, that users are not allowed to mount local file storage for
+security purposes.
+
+custom_mount_config_gui-3.png
+custom_mount_config_gui-4.png
+
+Once a backend has been selected, more configuration fields will appear. The
+displayed configuration fields may vary depending on the selected storage backend.
+For example, the FTP storage backend needs the following configuration details:
+
+-  **host**: the hostname of the ftp server
+-  **user**: the username used to login on the ftp server
+-  **password**: the password to login on the ftp server
+-  **secure**: whether to use ftps:// (FTP over TLS) to connect to the ftp
+   server instead of ftp:// (optional, defaults to false)
+-  **root**: the folder inside the ftp server to mount (optional, defaults
+   to ‘/’)
+
+If Dropbox or Google Drive as storage backend an OAuth dialog will be shown to
+automatically generate and fetch the required token information.
+
+.. _Amazon S3: http://aws.amazon.com/de/s3/
+.. _Dropbox: https://www.dropbox.com/
+.. _Google Drive: https://drive.google.com/start
+.. _OpenStack Swift: http://openstack.org/projects/storage/