Write index.js (break out into multiple files if >500 lines)

[smithki]

MVP features

• Snek eats squares, snek gets bigger.
• Snek collides with own body or other snek's body, snek dies.
• Squares appear randomly on the game map in unoccupied space (cannot be intersecting with snek).

To dos

• Write a utility function for hooking into the animation loop (should include delta time features). @Petroochio
• Write a utility function for instantiating HTML canvas. @Petroochio
• Write a utility function for drawing primitive shapes with HTML canvas (rectangles, ellipses, etc.). @Petroochio
• Write a Snek class with bare minimum gameplay methods. @smithki
• Write a basic Vector2 class with relevant math methods. @smithki
• Write a collision detection function that accepts a variadic number of sneks as arguments. @smithki
• Write a class for managing game logic @Petroochio