added customization

Assets/Code/Saves/SaveManager.cs

@@ -0,0 +1,23 @@
+using System.IO;
+using UnityEngine;
+
+namespace Code.Saves
+{
+    public static class SaveManager
+    {
+        private static string Path => Application.persistentDataPath + "/save.json";
+
+        public static void Save(GameData data)
+        {
+            var json = JsonUtility.ToJson(data, true);
+            File.WriteAllText(Path, json);
+        }
+
+        public static GameData Load()
+        {
+            if (!File.Exists(Path)) return new GameData();
+            var json = File.ReadAllText(Path);
+            return JsonUtility.FromJson<GameData>(json);
+        }
+    }
+}