Any resolution or resolutions authorizing any notes or bonds, or any issue thereof, may contain provisions, which shall be a part of the contract with the holders thereof, as to:
(1) Pledging all or part of the mortgage or deed of trust payments, charges and other fees made or received by the Housing Development Fund and other moneys received or to be received to secure the payment of the notes or bonds or of any issue thereof, subject to such agreements with bondholders or noteholders as may then exist;