Add initial project files and configurations for Unity setup

Assets/Scripts/Infrastructure/Unity/PlayerPrefsPersistenceAdapter.cs

@@ -0,0 +1,19 @@
+using Core.Ports;
+using UnityEngine;
+
+namespace Infrastructure.Unity
+{
+    public class PlayerPrefsPersistenceAdapter : IPersistenceService
+    {
+        public void Save(string key, int value)
+        {
+            PlayerPrefs.SetInt(key, value);
+            PlayerPrefs.Save();
+        }
+
+        public int Load(string key, int defaultValue = 0)
+        {
+            return PlayerPrefs.GetInt(key, defaultValue);
+        }
+    }
+}