ITR is Income Tax Return.
Normally ,the banker needs this standard proof of income of the prospective loanee to assess the borrowing capacity.
As is seen from your posting , you are approaching a bank for availing Housing Loan.
So, you have show any acceptable document in support of your financial standing ,so also Repayment ability for the entire term of the proposed loan.You can rope in a Co.borrower having steady income and produce his ITR for the purpose.
You can approach any experienced Tax Consultant locally or an Authorised Income Tax Return Preparer for prepn. and filing of ITR.