fix run and examples folred

bin/main.cpp

@@ -0,0 +1,23 @@
+#include "layers/ui_layer/ui_layer.hpp"
+#include "layers/ui_layer_double/ui_layer_double.hpp"
+
+namespace example
+{
+  class app : public VE::application
+  {
+    public:
+      app(std::string app_name) : VE::application{ app_name } {};
+      ~app() = default;
+  };
+}
+
+auto main(int argc, char* args[]) -> int
+{
+  example::app app{ "vertex_engine_sandbox" };
+
+  app.push_layer(
+    new example::ui_layer{},
+    new example::ui_layer_double{}
+  );
+  app.run();
+}