screen concept

src/start_screen.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "./screen.hpp"
+
+struct StartScreen final : public Screen {
+	StartScreen(void);
+	~StartScreen(void) = default;
+
+	// return nullptr if not next
+	// sets bool quit to true if exit
+	Screen* poll(bool&) override;
+};
+