waybar: add waybar module

modules/waybar/options.nix

@@ -0,0 +1,23 @@
+{lib, ...}:
+with lib.types; {
+  hm = {
+    battery = lib.mkOption {
+      type = bool;
+      default = false;
+      description = ''
+        `true` to display battery info
+      '';
+    };
+    fontFamily = lib.mkOption {
+      type = str;
+      example = "JetBrainsMono Nerd Font";
+      description = ''
+        needs to be a nerdfont
+      '';
+    };
+    fontSize = lib.mkOption {
+      type = str;
+      default = "12px";
+    };
+  };
+}