Add initial game systems and input handling for player interactions

Assets/Scripts/Infrastructure/PlayerPrefsPersistence.cs

@@ -0,0 +1,18 @@
+using UnityEngine;
+
+namespace Infrastructure
+{
+    public class PlayerPrefsPersistence : IPersistenceService
+    {
+        public void SaveHighScore(string key, int score)
+        {
+            PlayerPrefs.SetInt(key, score);
+            PlayerPrefs.Save();
+        }
+
+        public int LoadHighScore(string key)
+        {
+            return PlayerPrefs.GetInt(key, 0);
+        }
+    }
+}