add base files

modules/nix/fingerprint.nix

@@ -0,0 +1,14 @@
+# Documentation : /docs/fingerprint.md
+_: {
+  services.fprintd.enable = true;
+
+  security.pam.services = {
+    login.fprintAuth = true;
+
+    # sudo
+    sudo.fprintAuth = true;
+
+    # greetd (tuigreet / ReGreet)
+    greetd.fprintAuth = true;
+  };
+}