Rate user module

[ashwini0529]

Create a RATE USER module.
One can rate the user, if and only if the user did some project for that client.
The schema for rate would be :
{ "userId" : "123ewrfken4123123", "rating" : 3.2, "projectId" : "1231mewrwcewwrsdf" }

[ashwini0529]

@PiyushGoyal443 , check adding-backendbranch, Shubham has done the rating part. All you need to do is, to embed it in the master branch accordingly.

[ashwini0529]

@PiyushGoyal443 status?