Feedback tutorial

[ingar]

Hi,

I'm trying GWL to run a very simple workflow (it's the first time ever that I 
run workflows, no prior experience with CWL or others).

Following the tutorial has been a bit confusing sometimes, some feedback:
- I installed with GUIX some time ago, this worked
- I try to run the example with `guix workflow run file` (after some feedback 
from the `guix workflow --help` command about the possibilities)
  Doesn't work, apparently it needs to end in some specific extension.
  Figure out the extension by searching in the manual (not in the tutorial).
- Try again `guix workflow run file.w`: doesn't work, a workflow needs to be 
defined.
  Ok, I can look at the next example and infer how to write this.
  Run this. I don't get any output... (stdout)
- Ok, what do I need more? It looks like it succeeds...
- Look again at `guix workflow run --help`
  - Do I need a different engine?
  - Do I need a larger verbosity level? Let's try this: `guix workflow run 
file.w -v`
> Error: guix workflow run: the keyword '--verbosity' expects a value, but none 
> was given.
> Consider '' as an example of a valid value.
    That's not very useful...
  - Do I need to log events?

The current version 0.5.1 (currently in GUIX) doesn't yet contain the updated 
documentation
about the 'process' log event. I only figured out I needed 'all' or 'process' 
when looking through
the commits on https://cgit.git.savannah.gnu.org/cgit/gwl.git/ .

All those steps I expect to be answered in the tutorial, otherwise someone will 
give up very fast...
Someone needs to be able to run the hello world example after the tutorial! 
(and not be surprised about the (absence of) output)

Greetings,
Ingar