Add the simple HelpText.AutoBuild() function

[loxsmoke]

This is the minimal AutoText() function that can generate help text only from the command line parameters class.

Example:

HelpText helpText = HelpText.AutoBuild<MyCommandLine>();
Console.WriteLine(helpText.ToString());

I find it very useful for simple utilities that do not use verbs and have to show help text in case of invalid input data that cannot be detected by parsing.

[bannikovilea]

Hi!) I would be glad to get this method for my small project. Can you merge it ?