Datasets now serialize/save and deserialize/load properly. Created a test in the CLI project

SzCli/LocalFileManager.cs

@@ -0,0 +1,34 @@
+using SzLib;
+
+namespace SzCli;
+
+public class LocalFileManager : ISzFileManager
+{
+    public string DataPath
+    {
+        get
+        {
+            var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "data");
+            if (!Directory.Exists(path)) 
+            {
+                Directory.CreateDirectory(path);
+            }
+            
+            return path;
+        }
+    }
+
+    public bool SaveFile(string path, string fileContent)
+    {
+        try
+        {
+            File.WriteAllText(path, fileContent);
+            return true;
+        }
+        catch (Exception e)
+        {
+            Console.WriteLine($"Error saving file: {e.Message}");
+            return false;
+        }
+    }
+}