Ticket 2::1 Implement Income Categorization

[Blindspot22]

Description:
Implement the ability to add and categorize income sources within a budget.

Tasks:

1. Add functionality to input various income sources.
2. Create a system for categorizing each income source (e.g., salary, freelance income).
3. Ensure users can assign an amount to each income source.

Acceptance Criteria:
User can add multiple income sources to a budget.
Each income source can be categorized (e.g., salary, freelance).