Add kanshi.

nix/configuration/roles/kanshi/default.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  environment.systemPackages = with pkgs; [
+    kanshi
+  ];
+
+  home-manager.users.talexander =
+    { pkgs, ... }:
+    {
+      home.file = {
+        ".config/kanshi/config" = {
+          source = ./files/config_kanshi;
+        };
+      };
+    };
+}