Install CUPS

- CUPS is software that lets us print
diff --git a/modules/printing.nix b/modules/printing.nix
new file mode 100644
index 0000000..1d3281c
--- /dev/null
+++ b/modules/printing.nix
@@ -0,0 +1,20 @@
+{pkgs, ...}: {
+  config = {
+    services = {
+      printing = {
+        enable = true;
+        drivers = [pkgs.hplip];
+      };
+
+      avahi = {
+        enable = true;
+        nssmdns = true;
+      };
+    };
+
+    environment.persistence."/nix/persist".directories = [
+      "/var/spool/cups"
+      "/etc/cups"
+    ];
+  };
+}