Onboarding for TCN Contributors Part 2

[Shrinks99]

^{This initial comment is collaborative and open to modification by all.}

Task Summary

🎟️ Re-ticketed from: #
📅 Due date: N/A
🎯 Success criteria:

We need better resources for getting users started with GitHub and our projects once they have joined a working group.

To Do

• Add docs about GitHub and how it works for new people
  • PRs, Add / Delete / Change Files, Issues, Project boards
  • Instruct on GitHub Desktop client
  • Getting started with Markdown
• Introduction to how Element's UI works
  • Disable notifications unless mentioned!!

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Work is going on in this PR.

[benhylau]

I feel not to go into too much detail in this, as processes change and the docs may fall out of date. Instead, describe the basics and then plan to have a personal walkthru (e.g. monthly workflow trainings, every last saturday on a month) to onboard new ppl.