Add several basic policies for the 2i2c hubs

[choldgraf]

This adds three policies to our infrastructure documentation. We've discussed each of them over time but hadn't yet put them in a public place. I believe that we still need to improve them all, and in some cases may need a lawyer to give an official stamp of approval, so for now I have noted each of them as non-legally-binder policies that are there to set expectations.

Unclear if we can close out any of these issues so I'll cross-ref them below:

• ref: https://github.com/2i2c-org/infrastructure/issues/342
• ref: https://github.com/2i2c-org/docs/issues/139
• ref: https://github.com/2i2c-org/team-compass/issues/388

[choldgraf]

Both comments addressed - thanks @sgibson91

[sgibson91]

I haven't given an explicit approving review btw, because I think more eyes from the team would be good here. But if one doesn't come in within an appropriate timeframe, 👍🏻 from me to merge.

[choldgraf]

I've also just now pinged CS&S to take a look at these docs, since they might be needed for any "official / legal" policies that we have. So let's give it a few days and re-visit next week if nobody has provided another review since then. @sgibson91 if you "approve" I will still hold off until then before merging or moving forward.

[choldgraf]

FYI I heard from Paige at CS&S that they're OK with us posting this now if we wish. I've also asked if they can take a closer look but they said we can disentangle making these public vs. making them "legally official"

[choldgraf]

OK gonna merge this one in so that we have something to point people to! We can iterate from there