A friendly snake & ladder game

[vagishyagnik]

Hi 👋, I'm Vagish Yagnik

This PR adds a simple Snake & Ladder game
Using this, students can learn about a few design patterns commonly used in Java Development.

This Game consists of

• Player class : Stores player id, name, current position.
• Ladder class : Stores start & end position of the ladder & verifies that no 2 ladders starts at same position & other basic checks.
• Snake class : Stores face & tail position of the snake & verifies that no 2 snakes have same face position.
• Game class: Is a Monitor class which stores state of the game at any point in time. See the builder pattern here.
• PlaySnakeNLadder - Main class that populates Game class with players, ladders & snakes.

Kindly merge it under hacktoberfest-accepted label.

Sample Output -