On 4th March 2020, the supreme court of India has lifted the ban on buying and selling of cryptocurrencies in India. You can now buy and sell cryptos in India with your bank account.
There are many exchanges in India which offer crypto trading in INR. One of them is PCEX Member, it is an India based crypto trading platform on which you can buy, sell and trade cryptos with INR. They charge the lowest trading fee of 0.3% in the spot market along with zero deposit and withdrawal fee.
You can trade on their app as well, it is available on the Google Play Store.