Budgets

[Carlos Mecha]

A new entity to group expenses. It should contain a start and end date, and an amount. An expense can be part of multiple budgets, and it's going to be selected the same way that tags.

• /: Add an extra select2 field to select already created budgets.
• /budgets: Main page with all current and past budgets, and a form to create them.
• /budgets/<id>: The budget view contains all expenses for that budget and the basic information.

[Carlos Mecha]

Wait until merge