D2 - Create the page to add a transaction.

[Luis Fernando Jiménez]

Create the page to add a transaction.

• The user fills out a form to create a new transaction with:
  • name (mandatory)
  • amount (mandatory)
  • categories (mandatory at least one)
• The user click (or taps) the "Save" button to create the new category, and is taken to the transactions page for that category.
• When the user clicks on the "Back" button (<), the user navigates to the transactions page for that category.