Commit ID: 0009
Purpose: updating files

Additions:-
Class: GomokuModel to package uk.ac.wlv.cs5006.gomoku

Deletions:-
None

Changes:-
Updated SimpleModel to inherit from GomokuModel
Updated SimpleModel to override relevant methods from GomokuModel
Updated Row: changed field COLS identifier to static final
Updated Grid: changed field ROWS and COLS identifiers to static final

Bug Fixes:-
None