feat: add assignment 3 files

src/engine.cpp

@@ -84,7 +84,7 @@ void Engine::initialize()
 	// Initialize default shader
 	Logger::info("Loading default shaders...");
 	state::default_shader =
-	    std::make_shared<Shader>("data/vertex.glsl", "data/fragment.glsl");
+	    std::make_shared<Shader>("data/shaders/vertex.glsl", "data/shaders/fragment.glsl");
 	if (std::strlen(state::default_shader->error()) > 0) {
 		Logger::error(sstr("Failed to initialize shaders: ",
 				   state::default_shader->error()));