feat: basic config file

include/modules/memory.hpp

@@ -5,12 +5,14 @@
 #include <sys/sysinfo.h>
 #include <thread>
 #include "util/chrono.hpp"
+#include "IModule.hpp"
 
 namespace waybar::modules {
 
-  class Memory {
+  class Memory : public IModule {
     public:
       Memory();
+      auto update() -> void;
       operator Gtk::Widget &();
     private:
       Gtk::Label _label;