Added mastermind.py

[palak180]

Describe your changes (Mandatory)

Added a command line version of a classic board game 'Master Mind'.

Screenshots of your project output, whatever you have added. (Mandatory)

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] If it is a new project, I have done thorough tests.

[Yarlin16]

Brilliant work tbh 👏

[shrey141102]

Looks cool dude 👍🏻