The following tutorial demonstrates how to create a new swh module in the current swh
phabricator instance and reference it so the Continuous Integration (CI) is able to
build the new module.
It's problem oriented so it's more an how-to 
I've added it to the "tutorials" tree though as we don't have
a "how to" section yet...
It might be even possible this could go to the "contribute" section
but as not all steps could be done from an external contributor, I
kept it out.
Anyway, feel free to propose some improvments ;)
 https://documentation.divio.com/ (that's the approach we are trying to reach)
Related to T3179