added imgui and config file to project

include/grenderer.h

@@ -1,20 +1,27 @@
 #pragma once
 
-#include "gwindow.h"
+#include "gconfig.h"
+#include "gmenu.h"
 #include "gshader.h"
+#include "gwindow.h"
 #include "logger.h"
 
 class GRenderer {
 public:
-  GRenderer(GWindow *w, Logger *l);
+  GRenderer(GWindow *w, Logger *l, GConfig *c);
   ~GRenderer();
   void init();
   void update();
 
+  void init_imgui();
+  void update_imgui();
+
 private:
   Logger *logger;
+  GConfig *config;
   GWindow *window;
   GShader *shader;
+  GMenu *menu;
 
   unsigned int VAO;
   unsigned int VBO;