Create the hashing functions

[20Varun23]

Create a Hashing.js file and create two functions

1. generateAnionKey() := given the password(hashed from the frontend) and email, output the hashed value (put this in the backend, in a helper folder)
2. generatePrivateKey() := given the password, email and a salt, output the hashed value (Put this in the frontend, in the helper folder (again))