Updated End User guide to include Uploading Images using Dashboard

Included a procedure in the end user guide to upload an image using the dashboard, as an end user. Includes a sentence saying these
actions can be performed only if the cloud operator/admin have granted
the end user permissions to do so.

Change-Id: If37f2de9f21cbfcffa1e4e0bc04c7dadcc88eb91
Merge "Updated End User guide to include Uploading Images using Dashboard"