Added 5 popular Indian exchanges

[saiy2k]

I was little surprised that Indian bitcoin exchanges are not listed @ https://bitcoin.org/en/exchanges#asia Also noticed couple of other PRs with link to exchanges which are yet to be merged.

So I did some minimal ground work for the project maintainers to validate the Exchanges that I added in my commit.

Please check: https://docs.google.com/spreadsheets/d/18G1C1Gm9enHOLmgDS1b4FvqdpNSoj3Ijqf6Dsx4BEsk/edit?usp=sharing

That sheets lists

• CoinmarketCap.com - Rank | Score | 24h Volume
• Playstore - Link | Downloads | Rating | Review count
• Appstore - Link | Downloads | Rating | Review count

Hope this data helps the Project maintainers to quickly validate the submitted exchanges and deploy the Indian exchanges in Live website.

PS: If you like to see any other data that will help in validating the exchanges, I will be happy to gather those.

Thanks.