Add Custom Splash Screen

Hello, I am wondering how to add a custom splash screen on my PC Game! Please if anyone can help I would gladly appreciate it. I need it to be at least 5 seconds of my studios then switch to my main menu. I have a script but it just shows the logo for under a second and then switches.

How would I make it wait for 5 seconds?

 using UnityEngine;
 using System.Collections;
 
 public class SplashScreen : MonoBehaviour {
     public string loadLevelName; // Name of the level to load after the splash screen appears
     private bool isLoading = false;
 
     public static SplashScreen me;
     void Awake() {
         me = this;
     }
     
     void Start () {
         // Adjust the width of the image to fill the screen while maintaining the image aspect ratio
         GUITexture image = gameObject.GetComponent<GUITexture>();
         float imageRatio = (float) image.texture.width / (float) image.texture.height;        
         float screenRatio = (float) Screen.width / (float) Screen.height;
         Vector3 scale = Vector3.one;
         if (Screen.width >= Screen.height) scale.x *= imageRatio / screenRatio;
         else scale.y *= screenRatio / imageRatio;
         transform.localScale = scale;
     }
     
     void Update() {
         // Start loading the level on the next frame
         if (!isLoading) {
             Application.LoadLevelAdditive(me.loadLevelName);
             isLoading = true;
         }
     }    
     
     // Call from the loaded level to hide the splash
     public static void Hide() {
         if (me != null) me.gameObject.SetActive(false);
     }
 }