Added a logger interface

SzCli/Logger.cs

@@ -0,0 +1,27 @@
+using SzLib;
+
+namespace SzCli;
+
+public class Logger(ISzFileManager fileManager) : ISzLogger
+{
+    public bool LogToFile { get; set; } = true;
+    public string LogFilePath { get; set; } = Path.Combine(fileManager.DataPath, "log.txt");
+
+    public void Log(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ LOG] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ LOG] {text}\n");
+    }
+
+    public void LogError(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ ERR] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ ERR] {text}\n");
+    }
+
+    public void LogWarning(string text)
+    {
+        Console.WriteLine($"{DateTime.UtcNow} : [SZ WARN] {text}");
+        if (LogToFile) File.AppendAllText(LogFilePath, $"{DateTime.UtcNow} : [SZ WARN] {text}\n");
+    }
+}