Add lobby and scene managers, implement scene switching with fade in/out

Assets/Scripts/Managers/LobbyManager.cs

@@ -0,0 +1,21 @@
+using Sirenix.OdinInspector;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Zenject;
+
+public class LobbyManager : MonoBehaviour
+{
+    [Inject]
+    [SerializeField]
+    [ReadOnly]
+    private MusicManager musicManager;
+
+    [SerializeField]
+    private AudioClip backgroundMusicClip;
+
+    private void Start()
+    {
+        musicManager.Play(backgroundMusicClip);
+    }
+}