Added checking for updates

Services/FileLogger.cs

@@ -0,0 +1,52 @@
+using System.IO;
+
+namespace MossyUpdater.Services
+{
+    public class FileLogger : ILogger
+    {
+        private readonly string _logPath;
+        private readonly SemaphoreSlim _semaphore = new(1, 1);
+
+        public FileLogger()
+        {
+            var appDataPath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+            var appFolder = Path.Combine(appDataPath, "MossyUpdater");
+            Directory.CreateDirectory(appFolder);
+            _logPath = Path.Combine(appFolder, "log.txt");
+        }
+
+        public async Task LogInfoAsync(string message)
+        {
+            await WriteLogAsync(LogLevel.Info, message);
+        }
+
+        public async Task LogWarningAsync(string message)
+        {
+            await WriteLogAsync(LogLevel.Warning, message);
+        }
+
+        public async Task LogErrorAsync(string message, Exception? exception = null)
+        {
+            var fullMessage = exception != null ? $"{message} - Exception: {exception}" : message;
+            await WriteLogAsync(LogLevel.Error, fullMessage);
+        }
+
+        private async Task WriteLogAsync(LogLevel level, string message)
+        {
+            await _semaphore.WaitAsync();
+            try
+            {
+                var timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
+                var logEntry = $"[{timestamp}] [{level}] {message}{Environment.NewLine}";
+                await File.AppendAllTextAsync(_logPath, logEntry);
+            }
+            catch
+            {
+            }
+            finally
+            {
+                _semaphore.Release();
+            }
+        }
+    }
+}