Epic - Create data requirements

### Background on the problem the feature will solve/improved user experience
Our app currently lacks the data we need to be able to provide public defenders with statistics they need on

### Describe the solution you'd like
We need to gather and specify our data requirements for the open sentencing app.

### Tasks

- [x] Map out user journey
- [ ] Identify data needed at each step
- [x] identify potential sources of data
- [ ] identify risks/considerations associated with data gathering

### Acceptance Criteria

Standards we believe this issue must reach to be considered complete and ready for a pull request. E.g precisely all the user should be able to do with this update, performance requirements, security requirements, etc as appropriate.