Since Croatia is not a member of Schengen agreement, you will need a separate visa application for croatia.
The visa form, regime and fees info are available on the official website of the Croatian ministry of foreign affairs (http://www.mfa.hr/MVP.asp?pcpid=1615).
The address of Croatian embassy in India:
New Delhi
A-15 West End
New Delhi 110021
INDIA
Phone 0091 11 4166 3101, 4166 3102, 4166 3103
Fax 0091 11 4166 3100, 2411 6873