Added file changes in backend dto, entity and repository classes

Committed code for the files dealing with entity and repository classes as part of back end works. Modified files are

• • dto/HouseholdCarbonFootprintDTO.java

•       dto/UserProfileDTO.java

• •       entity/HouseholdCarbonFootprint.java

• •       entity/OurUsers.java

• •       entity/PasswordResetToken.java

• •       entity/Product.java

• •        entity/TransportationCO2Tracking.java

• •      repository/HouseholdCarbonFootprintRepository.java

• •       repository/PasswordResetTokenRepository.java

• •     repository/ProductRepo.java

• •      repository/TransportationCO2TrackingRepository.java

• •       repository/UserRepository.java