Initial commit, showing ui above target window

include/gui/Button.hpp

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "Widget.hpp"
+#include <string>
+
+namespace gsr {
+    class Button : public Widget {
+    public:
+        Button(mgl::vec2f size);
+        void on_event(mgl::Event &event, mgl::Window &window) override;
+        void draw(mgl::Window &window) override;
+    private:
+        mgl::vec2f size;
+        bool mouse_inside = false;
+    };
+}