Add GitHub documentation (#301)

Author: XAMPPRocky

src/SUMMARY.md

@@ -17,6 +17,7 @@
         - [Submitting a proposal](./compiler/steering-meeting/submit.md)
         - [How to run the planning meeting](./compiler/steering-meeting/how-to-run-planning.md)
         - [How to run a design meeting](./compiler/steering-meeting/how-to-run-design.md)
+- [GitHub](./github.md)
 - [Governance](./governance/README.md)
 - [Infrastructure](./infra/README.md)
     - [Other Installation Methods](./infra/other-installation-methods.md)

src/github.md

@@ -0,0 +1,45 @@
+# GitHub
+Github is where the Rust project hosts all of its code, as well as a large parts
+of its discussions.
+
+## Organisations
+
+- [`rust-lang`] — The Rust project organisation.
+- [`rust-embedded`] — The Embedded Working Group organisation.
+- [`rustwasm`] — The WebAssembly Working Group organisation.
+- [`rust-cli`] — The Command Line Application Working Group organisation.
+- [`rust-secure-code`] — The Secure Code Working Group organisation.
+- [`rust-gamedev`] — The Game Development Working Group organisation.
+
+[`rust-lang`]: https://github.com/rust-lang
+[`rust-embedded`]: https://github.com/rust-embedded
+[`rustwasm`]: https://github.com/rustwasm
+[`rust-cli`]: https://github.com/rust-cli
+[`rust-secure-code`]: https://github.com/rust-secure-code
+[`rust-gamedev`]: https://github.com/rust-gamedev
+
+## Team Repositories
+
+- [Compiler Team](https://github.com/rust-lang/compiler-team)
+- [Core Team](https://github.com/rust-lang/core-team)
+- [Crates.io Team](https://github.com/rust-lang/crates-io-cargo-teams)
+- [Infrastructure Team](https://github.com/rust-lang/infra-team)
+- [Language Team](https://github.com/rust-lang/lang-team)
+- [Moderation Team](https://github.com/rust-lang/moderation-team)
+- [Release Team](https://github.com/rust-lang/release-team)
+
+
+## Administration FAQ
+
+> Who administrates the `rust-lang` organisation?
+
+All core team members have the `admin` role.
+
+> How do I create a new repository under the `rust-lang` organisation, or make
+  changes that require `admin` level permissions?
+
+You can contact a GitHub admin directly, or post the request in [`project leads
+(public)`] stream on Zulip and an admin will be able to respond to your request
+there.
+
+[`project leads (public)`]: https://rust-lang.zulipchat.com/#narrow/stream/217588-project-leads.20(public)