Merge pull request #4 from OpenC-IIIT/master

Patch 1: Password aurthentication
Create password_authentication.cpp
Merge pull request #5 from himu2214225/master

Create password_authentication.cpp
Merge pull request #6 from OpenC-IIIT/master

Adding Vaibhav Jaimini
Merge pull request #15 from ramanujam17/master

Adding the password authentication from him2214225