Add PID to initial log output

This change writes out the host process ID when the process starts up so
that it's easier to determine which process to attach a debugger to.

Author: daviwil

src/PowerShellEditorServices.Host/Program.cs

@@ -103,8 +103,9 @@ static void Main(string[] args)
             Logger.Write(
                 LogLevel.Normal,
                 string.Format(
-                    "PowerShell Editor Services Host v{0} starting...",
-                    fileVersionInfo.FileVersion));
+                    "PowerShell Editor Services Host v{0} starting (pid {1})...",
+                    fileVersionInfo.FileVersion,
+                    Process.GetCurrentProcess().Id));
 
             // Start the server
             server.Start().Wait();