Add maintainers

Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>

pkgs/maintainers.nix

@@ -0,0 +1,7 @@
+builtins.mapAttrs (name: value: { email = name + "@bsc.es"; } // value) {
+  abonerib.name = "Aleix Boné";
+  arocanon.name = "Aleix Roca";
+  rarias.name = "Rodrigo Arias";
+  rpenacob.name = "Raúl Peñacoba";
+  varcila.name = "Vincent Arcila";
+}