Add contributing.md

Author: nathanaelhuffman

CONTRIBUTING.md

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+# Quartz project status and open source
+
+The Quartz repo is (and any associated repos are) public because
+
+1. It has always been our intention to make this open-source.
+2. We figured it's best to err on the side of doing this early instead of late.
+
+The associated projects and IP are under development, and are not guaranteed to be
+stable. It's probably not a good fit for your use case.
+
+And so, we thought it was important to explain where we're currently at, and
+manage your expectations.
+
+- We are a small company.
+
+- Our current goal is to get our current generation products finished and in
+  customers' hands.
+
+- We're writing IP and projects here in support of that goal, not as its own thing. 
+  We have no dedicated community-support engineers -- we're all working on the products, and
+  this development is a side effect.
+
+- These points together mean that we may not have enough bandwidth to review and
+  integrate outside PRs right now. This may change in the future.
+
+You're welcome to send PRs! If we have time, or if the PRs are very small or fix
+bugs, we may even integrate them in the near future. But be aware that we might
+not get to it for a while, by which time it might no longer be relevant.
+
+We've all dealt with those open source projects that feel open in name only, and
+have big patches and history-free source drops appearing from behind the walls
+of some large organization. We don't like that, and we're not going to do that.
+But please bear with us while we're scaling up.
+
+If you want to ask about whether a PR is consistent with our short-term plan
+_before_ you put in the work -- and you should! -- hit us up on the repo
+Discussions tab on GitHub.
+
+Thanks!