Schedule a Workflow after certain days using SDK

Hi,

I would like to schedule a workflow from SDK automatically without any user action.

in Opportunity, based on creation date, I have to send e-mail after 5 days to the sales team in CC with an Attachment. As CC is not possible in standard workflow solution. How can I achieve to schedule a workflow through SDK. Please suggest.

Here main motive is,

1. I have to keep CC of sales team. No individual e-mails

2. Schedule a workflow so that it will send an e-mail after 5 day of the opportunity creation with attachment.

Note : --> No User action here, like login into opportunity and do some changes and save the opportunity.

BR

Subbu