[UPDATE] PyQt5 gui

[Vashuev]

Hello again,
Here is the GUI with the following functionality:

1. status bar for basic messages
2. Pop-ups(Messagebox) for Messages like Email Sent, Discount Info, Input Error with feedback.
3. User Validation for all three input boxes
4. closing the selenium browser

also, I have updated app.png with the new GUI ( check it)

There are 2 more things which we need to work on

1. Icon for the app ( LOGO )
2. try .. Except for checking around the selenium driver ( in case someone has not active internet connection it crashes )

I have tested and done from my side, try it on mac also try with various type of conditions and let me know if there is an issue.

[harshsbais]

Awesome work!!