Could anyone please provide me with a template of offer letter

This is my first time to visit this forum, I think it's really cool as there are so many users and anonymous visits here, I hope I can come here frequently in the future; Could anyone please provide me with a template of offer letter from an employer, it's so urgent, I am working in an HR outsourcing company and I need an official offer letter so as to send the employees who have been hired, thanks so much.