Update README to better reflect usage.

Author: sampsapenna

README.md

@@ -1,9 +1,14 @@
-### swift-upload-runner – resumable browser file upload and replication
+### swift-upload-runner – better browser file upload and download for swift-browser-ui
+
 `swift-upload-runner` makes it possible to properly batch upload from browser
-into object storage backends using Openstack Swift API. It also makes possible
+into object storage backends using Openstack Swift API. It also will make possible
 proper container uploads without plaintext passwords or tokens, to prevent
 token expiration.
 
+Additionally, the runner contains functionality for downloading whole containers
+as an archive without intermediary storage, as well as proxying downloads from
+shared containers, i.e. containers where the project has access via an ACL entry.
+
 ### Installation
 `pip install git+https://github.com/cscfi/swift-upload-runner.git`