Add privacy docs

Author: kyleconroy

docs/privacy.md

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+# Privacy and Data Collection
+
+These days, it feels like every piece of software is tracking you. From your
+browser, to your phone, to your terminal, programs collect as much data about
+you as possible and send it off to the cloud for analysis.
+
+We believe the best way to keep data safe is to never collect it in the first
+place.
+
+## Our Privacy Pledge
+
+The `sqlc` program does not collect any information. It does not send crash
+reports to a third-party. It does not gather anonymous aggregate user behaviour
+analytics.
+
+No analytics. 
+No finger-printing.
+No tracking.
+
+Not now and not in the future.
+
+## Distribution Channels
+
+We distribute sqlc using popular package managers such as
+[Homebrew](https://brew.sh/) and [Snapcraft](https://snapcraft.io/). These
+package managers and their associated command-line tools do collect usage
+metrics.
+
+We use these services to make it easy to for users to install sqlc. There will
+always be an option to download sqlc from a stable URL.