website_forum_seo: adding new module for improving quality of forum questions and answers.

<b>New Module:</b> website_forum_seo

<b>Task:</b> https://www.odoo.com/web#id=9107&view_type=form&model=project.task&menu_id=3942&action=327
<b>Pad:</b> https://pad.odoo.com/p/r.aAXbFLdZvu62soZi