[IMP] Maifest for Github README.md on main apps

addons/account/README.md

addons/account_voucher/README.md

addons/crm/README.md

addons/google_calendar/README.md

addons/hr/README.md

addons/hr_recruitment/README.md

addons/mail/README.md

addons/mass_mailing/README.md

addons/mrp/README.md

addons/note/README.md

addons/point_of_sale/README.md

addons/project/README.md

addons/purchase/README.md

addons/sale/README.md

addons/stock/README.md

addons/website/README.md

addons/website_blog/README.md

addons/website_crm/README.md

addons/website_event/README.md

addons/website_event_track/README.md