add rudimentary bluetooth module functionality

include/modules/bluetooth.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <fmt/format.h>
+#include "ALabel.hpp"
+
+namespace waybar::modules {
+
+class Bluetooth : public ALabel {
+ public:
+  Bluetooth(const std::string&, const Json::Value&);
+  ~Bluetooth() = default;
+  auto update() -> void;
+
+ private:
+  ;
+};
+
+}  // namespace waybar::modules