Modules can be crated very easily. Only ceople of this have to be done:

1. Create module folder and module.php file.
2. Edit module.php and define existing module functions.
3. Create module actions templates.

Creating module main folder

Main module folder have to be created in "modules" folder and named "lh"

Then module.php file have to be created in the same folder. From there you can do all yourself just look how other system modules are done.