Add a dashboard/homepage

[VMelnalksnis]

Is your feature request related to a problem? Please describe. Right now in order to check on the current state of your finances, you need to go through many views - account overview, counterparty overview, and various reports.

Describe the solution you'd like An overview which would contain the basics:

• Balance of all your accounts
• Transactions for the current month
• Some basic reports for the last few months