Adding test cases for Signup workflow

[musukeshu]

Sign-up Workflow:

• GitHub Auth step (only once) via self call. If this step is not successful, then ask for login by redirecting to the basic signup page. If successful, then check for incomplete user details and redirect to the page where it can fill the details.
• With Submit, /user/details will send a patch call which contains all the details along with the userid.
• Then the Join section check whether user has been logged in or not . It asks to fill other details by prefilling the first and last name.
• This is a 4 page flow and in the 4th page we see the preview with Submit Button. On submit it sends a put request.
• In the backend there is a model known as applicants that checks all the user details and is only accessible by the super user.
• Finally it will land up on a page with a link which is a unique user and we get a button to get back to the home page.