[IMP] Web Warning Sounds

Implementation of Web Warning Sounds module. Please check README.rst file for more details on how it works.
You are right,  it is not necessary. But it is common for opensource projects to have such file because newcomers in odoo wouldn't know to check __openerp__.py for the description. At least that is my reasoning :). Going to remove it for the sake of consistency since no other module in this repo has it.