CONTRACTS: build a function to read user's position overview.

[Dprof-in-tech]

after a proposal has been accepted in issue #43 and the loan has been sent, these open positions should be displayed on the users portfolio page in the position overview tab

for borrowers, it should show the details of what was borrowed like:

token borrowed, expected repayment time, interest rate, amount borrowed, and a repay button.

build this function, write tests for it and integrate it into the frontend on the porfolio page.

[Pvsaint]

If it pleases you to assign me this issue, I'd be very grateful as this would be my first open source contribution, and I promise to deliver within 48 hours.