Added OS info to log file.

It is handy to know which version of the OS we are running on and what architecture for both the extension hosts and the OS.  Also, converted from \r\n to Environment.NewLine just in case this code runs on Linux/MacOSX someday.  :-)

Author: rkeithhill

src/PowerShellEditorServices.Host/EditorServicesHost.cs

@@ -86,17 +86,22 @@ public void StartLogging(string logFilePath, LogLevel logLevel)
                 FileVersionInfo.GetVersionInfo(this.GetType().Assembly.Location);
 #endif
 
+            var newLine = Environment.NewLine;
+
             Logger.Write(
                 LogLevel.Normal,
                 string.Format(
-                    "PowerShell Editor Services Host v{0} starting (pid {1})...\r\n\r\n" +
-                    "  Host application details:\r\n\r\n" +
-                    "    Name: {2}\r\n    ProfileId: {3}\r\n    Version: {4}",
-                    fileVersionInfo.FileVersion,
-                    Process.GetCurrentProcess().Id,
-                    this.hostDetails.Name,
-                    this.hostDetails.ProfileId,
-                    this.hostDetails.Version));
+                    $"PowerShell Editor Services Host v{fileVersionInfo.FileVersion} starting (pid {Process.GetCurrentProcess().Id})..." + newLine + newLine +
+                     "  Host application details:" + newLine + newLine +
+                    $"    Name:      {this.hostDetails.Name}" + newLine +
+                    $"    ProfileId: {this.hostDetails.ProfileId}" + newLine +
+                    $"    Version:   {this.hostDetails.Version}" + newLine +
+                     "    Arch:      {0}" + newLine + newLine +
+                     "  Operating system details:" + newLine + newLine +
+                    $"    Version: {Environment.OSVersion.VersionString}" + newLine +
+                     "    Arch:    {1}",
+                    Environment.Is64BitProcess ? "64-bit" : "32-bit",
+                    Environment.Is64BitOperatingSystem ? "64-bit" : "32-bit"));
         }
 
         /// <summary>