Whether you are a vegetarian or a vegan and you are planning on travelling to India, let me tell you that you will have absolutely no problem at all.
As vegetarians/vegans, one of the things that we worry about before visiting a foreign country is its cuisine and whether there will be many options for us or not. Sadly, in many European countries, their main dishes all have either fish or meat (or both) and we cannot eat many things in regular restaurants without reducing our diet to a basic salad made with lettuce and tomato - sometimes without even a single drop of oil. I have personally faced this problem many times in Spain... going to a mainstream restaurant and finding out that you either eat some undressed lettuce or you go back home with your stomach empty.