docs : Add Rapido to 'Who uses Amundsen?' (#717)

* Add Rapido to consumer list in readme
Signed-off-by: Palash Das <dpalash.new@gmail.com>
Signed-off-by: Palash Das <palashkok3@gmail.com>

* Add hover description
Signed-off-by: Palash Das <dpalash.new@gmail.com>
Signed-off-by: Palash Das <palashkok3@gmail.com>

README.md

@@ -213,6 +213,7 @@ Currently **officially** using Amundsen:
 1. [Merlin](https://merlinjobs.com)
 1. [PicPay](https://picpay.com.br)
 1. [PUBG](https://careers.pubg.com/)
+1. [Rapido](https://rapido.bike/Careers?lan=en "India's largest bike taxi service")
 1. [Remitly](https://www.remitly.com/)
 1. [Square](https://squareup.com/us/en)
 1. [WeTransfer](https://wetransfer.com)