Nougat for Samsung Galaxy A5 (2016) started rolling out earlier this month. Russia was the first market to get it and now the update has started hitting units in India. The update weighs in at around 985MB (985.58MB to be precise).
Given the fact that it's an OTA roll out, it might take time for the update to hit your device. You can manually check for the update by heading to your handset's Settings menu.