Update Screen system

Added FuelScreen (Working buttons)
Added SellScreen (Nothing working)

Game/Gui/Screens/FuelScreen.h

@@ -0,0 +1,13 @@
+#pragma once
+#include "../Screen.h"
+
+class FuelScreen : public Screen
+{
+public:
+
+	FuelScreen(const std::string& filePath, Point2f pos, Point2f size, TextureManager* manager);
+
+	virtual void Draw() const override;
+	virtual void Update(float elapsedSecs) override;
+	
+};