Mention GPU notification group

Author: apiraino

src/notification-groups/about.md

@@ -27,6 +27,7 @@ Here's the list of the notification groups:
 - [WebAssembly](./wasm.md)
 - [Windows](./windows.md)
 - [Rust for Linux](./rust-for-linux.md)
+- [GPU target](./gpu-target.md)
 
 ## What issues are a good fit for notification groups?
 

src/notification-groups/gpu-target.md

@@ -0,0 +1,18 @@
+# GPU target notification group
+
+**Github Label:** None <br>
+**Ping command:** `@rustbot ping gpu-target`
+
+This notification group deals with linker related issues and their integration
+within the compiler.
+
+The group also has an associated Zulip stream ([`#t-compiler/linker`])
+where people can go to ask questions and discuss GPU-related topics and issues.
+
+if you're interested in participating, feel free to sign up for this group! To
+do so, open a PR against the [rust-lang/team] repository and add your GitHub
+user to [this file][gpu-target-team].
+
+[`#t-compiler/arm`]: https://rust-lang.zulipchat.com/#narrow/stream/242906-t-compiler.2Farm
+[rust-lang/team]: https://github.com/rust-lang/team
+[gpu-target-team]: https://github.com/rust-lang/team/blob/main/teams/gpu-target.toml