added Serilog and file logging (#17)

code/Common/Configuration/Logging/FileLogConfig.cs

@@ -0,0 +1,12 @@
+namespace Common.Configuration.Logging;
+
+public class FileLogConfig : IConfig
+{
+    public bool Enabled { get; set; }
+    
+    public string Path { get; set; } = string.Empty;
+    
+    public void Validate()
+    {
+    }
+}

code/Common/Configuration/Logging/LoggingConfig.cs

@@ -0,0 +1,16 @@
+using Serilog.Events;
+
+namespace Common.Configuration.Logging;
+
+public class LoggingConfig : IConfig
+{
+    public const string SectionName = "Logging";
+    
+    public LogEventLevel LogLevel { get; set; }
+    
+    public FileLogConfig? File { get; set; }
+    
+    public void Validate()
+    {
+    }
+}