add section on where to find libs team

Author: KodrAus

src/libs/README.md

@@ -1,3 +1,9 @@
 # Libs
-This section documents meta processes by the libs team.
 
+This section documents meta processes by the Libs team.
+
+## Where to find us
+
+The libs team hangs out primarily in [the rust-lang Zulip](https://rust-lang.zulipchat.com/) these days in the `#t-libs` stream.
+
+The `#rustc` IRC channel on `irc.mozilla.org` is in a "quasi-deprecated" status and is not recommended.