Create Contributor Pathways

[magdmartin]

This ticket follows this forum thread and focuses on the first playbook named: Contributor Pathways.

This ticket is currently a placeholder to request feedback. An early draft of the playbook structure is available in this public Google Document (only section 2Contributor Pathways). I do not plan to open a PR until the content is more advanced in the Google Doc.

I will open separate tickets and PRs for the two other handbooks.

You can provide your feedback on this ticket, in the forum thread, or in the Google Doc as it suits you.