Write tutorial for calculating SWHIDs locally

A step-by-step tutorial to calculate the SWHIDs as we do in presentations, how it can be calculated locally and how it matches what we find on the archive. Also it can be nice to reference the code fragment in charge of the SWHID with a SWHID :-)

Main specs are here: https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html

There is the cli steps here: https://docs.softwareheritage.org/devel/swh-model/cli.html

there are some details in https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html eg. https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html#swh.model.identifiers.directory_identifier or https://docs.softwareheritage.org/devel/apidoc/swh.model.identifiers.html#swh.model.identifiers.revision_identifier

Migrated from T3016 (view on Phabricator)

Edited Jan 07, 2023 by Phabricator Migration user