add unsafe-code-guidelines directory

working-groups/unsafe-code-guidelines/NOTES.md

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+This file will contain summaries from the meetings where the
+unsafe-code-guidelines WG synchronizes with the lang team and broader
+community. That hasn't happened yet. =)

working-groups/unsafe-code-guidelines/README.md

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+# Unsafe Code Guidelines (UCG) Working Group
+![working group status: active][status]
+
+The goal of the Unsafe Code Guidelines (UCG) effort is to
+collaboratively produce a "reference guide" for writing unsafe code
+that what kinds of things unsafe code can and cannot do.
+
+- **Leads:** [@nikomatsakis][nikomatsakis], [@avadacatavra][avadacatavra]
+- **Meeting Notes:** [All](NOTES.md)
+- **Dedicated repository:** [rust-lang/unsafe-code-guidelines][ucg]
+
+[ucg]: https://github.com/rust-lang/unsafe-code-guidelines
+[status]: https://img.shields.io/badge/status-active-brightgreen.svg?style=for-the-badge
+
+# How can I get involved?
+
+You will find complete instructions on how to participate in [the
+rust-lang/unsafe-code-guidelines repository][ucg]. The conversation is
+mostly taking place asynchronously over GitHub issues although we do
+also have weekly synchronization meetings and the occasional video
+chat.
+
+- **Zulip stream:** [`#t-lang/wg-unsafe-code-guidelines`][zulip] on Zulip
+
+[repo]: https://github.com/rust-lang/rust
+[zulip]: https://rust-lang.zulipchat.com/#narrow/stream/122657-t-compiler.2Fwg-nll
+
+
+[nikomatsakis]: https://github.com/nikomatsakis
+[avadacatavra]: https://github.com/avadacatavra
+[RalfJung]: https://github.com/RalfJung