Adding a username in the main menu

[007vedant]

1. Players can type their username before the starting the game in the main menu.
2. The username could be be displayed in the bottom-center of the playing window.

Hacktoberfest 2021 contributions are welcome 🚀 🎉

[JanaganSaravanan]

Hi! Is this issue still open ? If so, I would like to work on it.