Hi All,
While googling i came across couple of links that explain the Apps development in sharepoint 2013. Hope these links may help others too so i am sharing here.
http://blog.concentra.co.uk/2012/12/13/office-2013-apps/
http://blog.concentra.co.uk/2013/02/04/understanding-odata/
http://blog.concentra.co.uk/2013/01/31/restful-services/
http://blog.concentra.co.uk/2013/02/06/odata/
Regards Amit