Surinder-Old Cruze till May 2012's clutch is very hard.From July 2012,because of new engine,clutch feels smoother than before.
BTW,you can't convert an Manual Transmission into Automatic Transmission.
If you want Auto Transmission Car in Diesel,go for Skoda Laura DSG or again Cruze AT or Elantra CRDI AT or Jetta High Line AT.