Add register user selenium test

[Niraj-Kamdar]

Describe the test

Add a test to register a new user using selenium webdriver.

What it covers

It will cover front-end test for the registration of new valid and invalid user.

Testing

Some tests for the above testcase. (Implementer will add following fields to cover every tests)

Description	Input	Output
Add user with unique username and email with valid passsword	username, email, password, confirm password	redirect to login page with successful registration flash