Fix Incorrect/Different Rules

[Jacrac04]

Overview:

This changes how the game is played by allowing boxes made from both player colours and whoever completes the box gets the point. It also gives a player a second go after completing a box. Fixes #1

Changes Made:

• Allow Mixed Colour Boxes
• Add Second Go After Gaining A Point
• Update README.md

To Be Completed:

• README screenshots need updating

[depressoq2]

Where to play the game