feat(policies): add team policies

TEAM-POLICIES.md

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+# Team Policies
+
+This documents two policies, 1) observing a team meeting, and 2) joining the team.
+
+## Team composition
+
+This document aims to formalize the procedures for getting membership in the Rust
+community team.
+
+------
+
+In general, we should encourage participation from community members who are not part of the team,
+as outlined in the observer policy (below).
+
+In some cases such participating members may have enough involvement that we feel it advatageous to
+include them in the team. Some reasons for doing this may be:
+
+ - Recognition: If someone is especially active in this space, it is worth adding them to the team to recognize them.
+ - "Officializing": For some tasks, like talking with other companies, it is useful to be able to say you are "X of the Rust Community Team"
+
+Most community team activities should be designed such that as much as possible, team membership is not required.
+
+To add someone as a member, they need to be nominated by an existing member on the private community team mailing list.
+Team members can voice approval/objections, and come to consensus on the topic. Consensus is judged by the community team lead.
+In general for team additions this will skew towards there being unanimous approval with at worst minor concerns.
+
+(NOTE: With the advent of subteams this may include relevant subteam leaders for judging consensus)
+
+Voluntarily leaving the team can be done by contacting the community team lead or mailing list. If you wish to re-join
+afterwards you will have to be nominated again.
+
+-----
+
+## Observer policy
+
+This document aims to formalize our meeting structure with respect to external observers and participants.
+
+-----
+
+Meetings are open by default. Specific topics may require a more closed video meeting or a meeting
+in a private channel, but in general we should hold our meetings in public.
+
+Non-team folks can drop by and take part in discussions if they wish, however they may be asked to
+wait till later to say their bit in case it's not the topic being discussed. This puts them at the same level as
+team members during an open team meeting. We can tweak this on a per case
+basis; if we're running out of time and need team feedback we can ask them to wait till later
+even if on topic.
+
+If someone not from the team wishes to lead or participate in an agenda item, they may comment on
+the agenda issue or ask a team member to set it up for them. We try to give priority to agenda items
+involving such guests, since they may not be able to make it for other meetings.
+
+If a member has an agenda item you're leading in a meeting, a couple days before the meeting they
+should try to consider if there are non-team members you'd want to be there, and invite them if so
+(mentioning that they have been invited in the issue).