Thank you very much for sharing this, OP!
I do recommend to everyone to post all of the scams that you have encountered in this forum. Not only do you warn others of your experience but it also serves as a reminder that there are various ways of scams across all social media platforms. As a general rule, do NOT entertain any messages from stranger or unknown persons who suddenly added you. 9 out of 10 times, they are scammers that will take advantage of anything that can be stolen!
OP, I find it very hard to believe that someone would offer that amount of money for such a inconceivable request- which is your username. To all newbies who will be reading this post, remind yourself that if an offer is to good to be true, then 99% of the time it is a scam!