add: Simple widget system

frame/src/widgets/clock/Analog.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "../Widget.hpp"
+
+#include <chrono>
+
+namespace frame::widgets
+{
+
+    class AnalogClock : public Widget
+    {
+        using Time = std::chrono::time_point<std::chrono::system_clock>;
+
+        Time last_time;
+
+    public:
+        static Widget::shared_ptr Create();
+
+        void Update() override;
+        void Render(render::RenderTarget& rt) override;
+    };
+} // namespace frame::widgets