Rename SzLib to SzCore

SzCore/ISzFileManager.cs

@@ -0,0 +1,12 @@
+using SzCore.DataObjects;
+
+namespace SzCore;
+
+public interface ISzFileManager 
+{ 
+    public string DataPath {get;}
+    public string DatasetsPath {get;}
+    
+    public bool SaveFile(string path, string fileContent);
+    public string? LoadFile(string path);
+}