finalizing main menu + DI container

Assets/Code/DI/DIContainer.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Code.DI
+{
+    public class DIContainer : MonoBehaviour
+    {
+        private readonly Dictionary<Type, object> _services = new();
+
+        private void Awake()
+        {
+            DontDestroyOnLoad(gameObject);
+        }
+
+        public void Register<T>(T service)
+        {
+            var type = typeof(T);
+            if (!_services.TryAdd(type, service))
+            {
+                Debug.LogWarning($"Service {type} is already registered.");
+            }
+        }
+
+        public T Resolve<T>()
+        {
+            var type = typeof(T);
+            if (_services.TryGetValue(type, out var service))
+            {
+                return (T)service;
+            }
+            throw new Exception($"Service {type} not found.");
+        }
+    }
+}