Set default shells

Explicitly set default shells so that opening a new terminal will
automatically use the correct shell.

Change-Id: Ie82f3d8d3cbb478006722082dda7f24d0795873d
Reviewed-on: https://git.clicks.codes/c/Chimera/NixFiles/+/409
Tested-by: Samuel Shuert <coded@clicks.codes>
Reviewed-by: Skyler Grey <minion@clicks.codes>
diff --git a/modules/nixos/shell/default.nix b/modules/nixos/shell/default.nix
new file mode 100644
index 0000000..5ce6545
--- /dev/null
+++ b/modules/nixos/shell/default.nix
@@ -0,0 +1,6 @@
+{ pkgs, ... }: {
+    programs.zsh.enable = true;
+
+    users.users.minion.shell = pkgs.bashInteractive;
+    users.users.coded.shell = pkgs.zsh;
+}
\ No newline at end of file