ExpenseCalculator

Functions:

- Let you save every transaction for a specific day/month/year
- Calculates the balance between expenses and incomes
- Calculates separately incomes and expenses
- Archives every expense in a category
- Gives you charts and summaries of the expenses for every category
- Let you see with a graphic the amount of expenses and incomes for every month
- Gives you statistics on the categorie where you are spending or gaining more