[Frontend] Create Cases section

[amlannandy]

Is your feature request related to a problem? Please describe. Routes for handling cases are already present in the flask server. The plan is to implement those routes in the React App. There are some minor issues in those routes, which I will also fix along the way.

Describe the solution you'd like N/A

Describe alternatives you've considered N/A

Additional context I'll submit a PR for it after resolving #149