Added intro screen.

Assets/Scripts/Intro/Intro.cs

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+using UnityEngine;
+using System.Collections;
+
+public class Intro : FadeCallback
+{
+    public AudioSource music;
+
+    public MonoBehaviour faderScript; // Reference to the Fader script for handling the fade effect
+
+    private IEnumerator playAudioCoroutine;
+
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update() { }
+
+    public override void OnFadeStarted()
+    {
+        playAudioCoroutine = PlayAudioThenActivateGameObject();
+        StartCoroutine(playAudioCoroutine);
+    }
+
+    public override void OnFadeComplete() { }
+
+    public void forceStopAudioCoroutine()
+    {
+        if (playAudioCoroutine != null)
+        {
+            StopCoroutine(playAudioCoroutine);
+            playAudioCoroutine = null;
+        }
+
+        music.Stop();
+    }
+
+    private IEnumerator PlayAudioThenActivateGameObject()
+    {
+        music.Play();
+        yield return new WaitUntil(() => music.time >= music.clip.length);
+        faderScript.Invoke("resetFader", 0.0f);
+    }
+}

Assets/Scripts/Intro/Intro.cs.meta

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+fileFormatVersion: 2
+guid: 594bb1fe3171425d5abf1bba51562952

Assets/Scripts/Intro/IntroSkipper.cs

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+using UnityEngine;
+using UnityEngine.InputSystem;
+
+public class IntroSkipper : MonoBehaviour
+{
+    public Intro fadeIn;
+
+    public Fader fadeOut;
+
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        var keyboard = Keyboard.current;
+        var mouse = Mouse.current;
+
+        if (keyboard != null && keyboard.anyKey.wasPressedThisFrame
+            || 
+            mouse != null && mouse.leftButton.wasPressedThisFrame)
+        {
+            fadeIn.forceStopAudioCoroutine();
+            fadeOut.resetFader();
+        }
+    }
+}

Assets/Scripts/Intro/IntroSkipper.cs.meta

@@ -0,0 +1,2 @@
+fileFormatVersion: 2
+guid: ee75bedbbbf072e1ca4d633925674475