Please come to India soon
Hey @krishna122356,
fingers crossed it will come to India soon, but until then the only thing you can do is keeping an eye on the social media channels and on blog.google.com as you would see an announcement there when Stadia will be released to more countries.
You can also submit feedback to the developers that you would love to see Stadia in India. Simply tap your profile picture in the top right corner on stadia.google.com or in the Stadia App and select "feedback".