add: Simple widget system

frame/src/ScreenManager.hpp

@@ -0,0 +1,36 @@
+#pragma once
+#include "display/IDisplay.hpp"
+#include "render/RenderTarget.hpp"
+#include "widgets/Widget.hpp"
+
+#include <chrono>
+#include <memory>
+
+using namespace std::chrono_literals;
+
+namespace frame
+{
+
+    class ScreenManager
+    {
+        std::unique_ptr<display::IDisplay> mDisplay;
+
+        render::RenderTarget mRenderTarget;
+        widgets::Widget::shared_ptr mRoot;
+
+        std::chrono::duration<double> mUpdateInterval = 0.5s;
+
+        bool mIsRunning = true;
+
+    public:
+        ScreenManager(std::unique_ptr<display::IDisplay> pDisplay);
+
+        void Update();
+        void Render();
+
+        void MainLoop();
+
+        void setRoot(widgets::Widget::shared_ptr widget);
+    };
+
+} // namespace frame