Describe how workspaces work

[michielbdejong]

See https://github.com/solid/solid-spec/blob/458c08b3396362519e7e211fa1b14508a77425bb/README.md#personal-data-workspaces
for how workspaces used to be mentioned in the Solid spec. The current spec no longer talks about workspaces,but there is still a mention of them when you create a thing from the 'Your stuff' view:

See also solid/solid#23

[timea-solid]

Oh.. I did not come across workspaces so far. What are they?
@timbl what do you think? Are they still in the protocol or was it experiemental? Do we want users to make use of them or...

[timea-solid]

Because we do not have a label for it -> this is low priority. It is to be determined if workspaces will be kept or not.