created gui directory and namespace

src/gui/style.h

@@ -0,0 +1,15 @@
+#ifndef YAZE_APPLICATION_CORE_STYLE_H
+#define YAZE_APPLICATION_CORE_STYLE_H
+
+#include <imgui/imgui.h>
+#include <imgui/imgui_internal.h>
+
+namespace yaze {
+namespace gui {
+
+void ColorsYaze();
+
+}  // namespace gui
+}  // namespace yaze
+
+#endif