Add testimonials section on home page

[Sachin Chaurasiya]

This issue is to track adding a testimonials section on the home page, UI should look something like this.

cc: @devyani-kaushik

@ShilpaVernekar, Please provide testimonials content for the same.
cc : @harshach @mesmith027 @shahsank3t

[Shilpa Vernekar]

Thanks for creating this @Sachin-chaurasiya .... I was thinking about the same in the meeting today morning :)
Here's the doc for testimonials
I'll update here once I add the new ones

[Ashish Gupta]

#49