Create the page to add a transaction

[luigirazum]

"Add a new transaction" page

• 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 transaction, 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.

---

• Create unit and integration tests for all the most important components of your RoR application.
• You should follow the provided design guidelines, including:
  • Colors.
  • Typography: font face, size and weight.
  • Layout: composition and space between elements.

  NOTE: In these design guidelines there are several UIs that you won't need for this exercise; also, some pages are not given a design and you will create them following the design guidelines of the other pages.

• You should validate all user input to make sure that anyone with bad intentions cannot compromise your app.
• You can use a view template engine of your choice (.erb, .slim, .haml).
• The project should be deployed and accessible online.