Authentication

Hi! this is a WIP expense tracker, it's only usable by me for now but I could to make it available to more people but it would need more features.

Things you can do for now:

• Check your balance
• Add money
• Allow other people to login
• Spend money and categorize your expense
• Check all the transaction you made
• Stats about categories

Things I would like to add:

• Delete specific transactions
• Reset accounts