feat: DebugOverlay for rendering debug information

src/DebugOverlay.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <SFML/Graphics/Font.hpp>
+#include <SFML/Graphics/RenderWindow.hpp>
+#include <SFML/Graphics/Text.hpp>
+#include <SFML/System/Clock.hpp>
+#include <string>
+
+class DebugOverlay {
+   public:
+    DebugOverlay(const std::string& fontPath);
+
+    void update(int drawCalls, float timescale, const sf::RenderWindow& window);
+    void draw(sf::RenderWindow& window);
+
+   private:
+    sf::Font m_font;
+    sf::Text m_text;
+    sf::Clock m_fpsClock;
+    float m_fps = 0.f;
+};