[blog] Implement RSS Feeds

- Task: https://www.odoo.com/web?debug#id=9547&view_type=form&model=project.task
- Pad: https://pad.odoo.com/p/r.SIeozbGyEfAhkzKO
@rim-odoo I can't understand what you mean? I guess did you mean RSS are missing on here. actually user default get RSS not Atom so i can't added RSS .