README: document nix fmt

Mic92 · Dec 17, 2024 · d022dff · d022dff
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@@ -227,6 +227,13 @@ wrapper:
 $ ~/git/nix-update/bin/nix-update --commit hello
 ```
 
+This project uses [treefmt-nix](https://github.com/numtide/treefmt-nix) for formatting.
+It can be run on the repository like that:
+
+```
+$ nix fmt
+```
+
 ## TODO
 
 - create pull requests