Add initial onboarding notes

Author: Mark-Simulacrum

src/SUMMARY.md

@@ -1,6 +1,7 @@
 # Rust Forge
 
 [Overview](./README.md)
+- [Onboarding to the project](./onboarding.md)
 - [Platforms](./platforms/README.md)
   - [Twitter](./platforms/twitter.md)
   - [Discord](./platforms/discord.md)

src/onboarding.md

@@ -0,0 +1,53 @@
+# Onboarding to the Project
+
+This document is a starting point for a new team member (or a refresh for
+existing team members) on things that are useful to know as a member of the
+project, in particular in terms of where to raise concerns or get help.
+
+## Relationship to Council
+
+The Leadership Council formally takes positions on behalf of the Project when
+needed. All Rust project members are officially represented by approximately
+one member of the council (some teams parent up to two or more members).
+
+Generally speaking, any concerns you have that are either more widely
+applicable (i.e., not just your team) or you feel aren't being fully handled
+within your team can be escalated to the Council. Note that interpersonal
+concerns and/or code of conduct violations should always be directed to the
+Moderation team.
+
+Escalating to the Council can be done via:
+
+- Zulip, on [#council](https://rust-lang.zulipchat.com/#narrow/channel/392734-council)
+- Zulip DM, to your council representative (see
+  [council](https://www.rust-lang.org/governance/teams/leadership-council) for
+  which team each representative represents).
+
+Either can be a reasonable starting point, please select what you feel more
+comfortable with, though bias towards being public.
+
+Leadership Council positions are elected by the Project teams on a rotating
+calendar, see [Council term limits] for more details.
+
+[Council term limits]: https://rust-lang.github.io/rfcs/3392-leadership-council.html#term-limits
+
+## Relationship to Foundation
+
+The Foundation works to support the project, and the project has direct
+representation on the Foundation's board (the 5 project directors). Those
+directors are selected by the Leadership Council per the [bylaws].
+
+Those directors have 50% of the vote on any Board vote in the Foundation,
+regardless of the number of non-Project directors.
+
+The website has the [current project directors].
+
+Please reach out whether you're just interested, have questions, or have concerns in:
+
+- Zulip, on [#foundation](https://rust-lang.zulipchat.com/#narrow/channel/335408-foundation)
+- To the Council (see above)
+- To one of the Project Directors (see member list above), recommending Zulip
+  DM as an initial point
+
+[current project directors]: https://www.rust-lang.org/governance/teams/launching-pad#team-foundation-board-project-directors
+[bylaws]: https://rustfoundation.org/policy/bylaws/#section-2.4-privileges-of-individual-membership