add example for swift v3

admin_manual/configuration_files/primary_storage.rst

@@ -46,6 +46,10 @@ Openstack Swift
 
 The Swift backend mounts a container on an OpenStack Object Storage server into the virtual filesystem. The class to be used is :code:`\\OC\\Files\\ObjectStore\\Swift`
 
+Both openstack v2 and v3 authentication are supported,
+
+V2 Authentication:
+
 ::
 
 	'objectstore' => array(
@@ -67,6 +71,28 @@ The Swift backend mounts a container on an OpenStack Object Storage server into
 		),
 	),
 
+V3 Authentication:
+
+::
+
+	'objectstore' => array(
+		'class' => 'OC\\Files\\ObjectStore\\Swift',
+		'arguments' => array(
+			'autocreate' => true,
+			'user' => [
+				'name' => 'swift',
+				'password' => 'Secr3tPaSSWoRdt7',
+				'domain' => [
+					'name' => 'default'
+				]
+			],
+			'serviceName' => 'swift',
+			'region' => 'regionOne',
+			'url' => "http://example.com/v3",
+			'bucket' => 'nextcloud'
+		)
+	),
+
 Amazon S3
 ---------