__________ (receipient’s details)
Date: __/__/_____ (Date)
My name is ____________ (name) and I write this letter in reference to the ____________ (project name).
We as a team had decided to be a part of this project and consider the deadline as __/__/_____ (mention date of deadline). I am happy to inform you all that we have successfully completed our project before the deadline and this was all possible due to your support and dedication.
I am highly thankful for the support and cooperation. I ensure to look forward and invite you to be a part of the coming projects till then best of luck.
____________ (Contact details)