Would Like to contribute But need to learn flutter first :D

I have tried to build a web app using react to manage group expenses but failed to structure the code properly [Github link](https://github.com/ssahaxd/expenses).
Your project looks awesome and well structured. I would like to contribute by adding a group expense management feature.

**Use cases of the feature:** When we travel/ stay in a group people randomly pay the bills but in the end, we have to split the total expense among all the group members. This app will help us do the same.

Users can create a group and add other users to edit, manage, or just view the expenses. There may be some group users who do not have the app on their phone but those who have the app can see the group and expenses in their app. Users who are in some group but currently do not have the app can download the app in the future and see the data if they wish to.

the expense did by a user towards a group should also reflect in his/her personal expense list.
there are so many more little details but basically this is the main feature.

I would Like to know your thoughts about the feature and how this should be architected?