Create emscripten.md

Author: juntyr

src/notification-groups/emscripten.md

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+# Emscripten notification group
+
+**Github Label:** [O-emscripten] <br>
+**Ping command:** `@rustbot ping emscripten`
+
+[O-emscripten]: https://github.com/rust-lang/rust/labels/O-emscripten
+
+This list will be used to ask for help both in diagnosing and testing
+Emscripten-related issues as well as suggestions on how to resolve
+interesting questions regarding our Emscripten support.
+
+The group also has an associated Zulip stream ([`#t-compiler/emscripten`])
+where people can go to pose questions and discuss Emscripten-specific
+topics.
+
+So, if you are interested in participating, please sign up for the
+Emscripten group! To do so, open a PR against the [rust-lang/team]
+repository. Just [follow this example][eg], but change the username to
+your own!
+
+[`#t-compiler/emscripten`]: TODO
+[rust-lang/team]: https://github.com/rust-lang/team
+[eg]: TODO