newmodule
This file contains the main description of the newmodule module. Usually, it's used to explain the main features of the activity, with a natural language. Also, the overall process of the activity is detailed here with its pedagogical foundation.
From a developer perspective, this "help" directory will contain simple html files like this that you will be able to link from newmodule code when any sort of explanation is necessary (it's easier to add those links automatically, both from the formslib stuff (see mod_form.php) and from everywhere else (see the helpbutton() function).
Also, don't forget to add one link to this help file from the newmodule/help "index.html" file, it will allow Moodle to show all the existing help files related to the module when the complete list of available help files is requested.
Please, replace me with the real information about the newmodule!