I would wait until you have the minutes to send.
Is this via e-mail? If so "Hello everyone" is probably an accpetable salutation. It's never "dears" - "Dear" is always singular.
Don't forget that sentences start with a capital letter.
It was a tremendous pleasure to work with you on this project. Attached are the minutes of our meeting on [date of meeting]. Please let me know if you have any questions.
I look forward to working with you again in the future.