Added

• You can now customize a game by choosing any word length (2~15) or radomize it!
• Enter hangman or hangman -h/--help to view options list.
• You can now enjoy the game offline! (This took me TOO LONG) Enter hangman -g -o to start an offline game.

Changed

• Now you have to enter hangman -g/--game to start a game of hangman.
• Optimize game experience by adjusting output sequence and timings.
• Use CLI11 library to parse input commands.

Fixed

• Fixed printing blank lines when there are no strikes.