I need a flutter chatting page, you can chat with your friends that you have in my padel app $,$ use fire base $,$ Make a good simple design and make it work, i need a ful Code and what should the main.dart be Make every step clear ofwhich class im using and without error $($Snap$.$data.docs$)$ always has error and a red underline under docs, this.sender and this.text has error I want no errors please $,$ and i dont need a sign in page, just the chatting page and make it work The docs doesnt work