add logger

Logger/SimApiLoggerProvider.cs

@@ -0,0 +1,22 @@
+using System.Collections.Concurrent;
+using Microsoft.Extensions.Logging;
+
+namespace SimApi.Logger
+{
+    public class SimApiLoggerProvider : ILoggerProvider
+    {
+        private readonly ConcurrentDictionary<string, SimApiLogger> _loggers =
+            new ConcurrentDictionary<string, SimApiLogger>();
+
+
+        public ILogger CreateLogger(string categoryName)
+        {
+            return _loggers.GetOrAdd(categoryName, name => new SimApiLogger(name));
+        }
+
+        public void Dispose()
+        {
+            _loggers.Clear();
+        }
+    }
+}