copy from github

Runtime/ISaveStorage.cs

@@ -0,0 +1,22 @@
+using System.Threading.Tasks;
+
+namespace Jovian.SaveSystem {
+    /// <summary>
+    /// Reads and writes raw byte arrays to a persistent location.
+    /// Has no knowledge of save data types or serialization formats.
+    /// </summary>
+    public interface ISaveStorage {
+        void Write(string path, byte[] data);
+        byte[] Read(string path);
+        bool Exists(string path);
+        void Delete(string path);
+        string[] List(string directoryPath);
+        void CreateDirectory(string path);
+
+        Task WriteAsync(string path, byte[] data);
+        Task<byte[]> ReadAsync(string path);
+        Task<bool> ExistsAsync(string path);
+        Task DeleteAsync(string path);
+        Task<string[]> ListAsync(string directoryPath);
+    }
+}