Adds practice folder + matrix creation
Adds ship methods: length, in_place; Game class
Adds lecture notes & updates readme
Getting ready for board
Adds board methods
Adds board: create, receive shot + tests
WIP: board - receive_shot & ship_list
Minor refactor, WIP add_ship
Adding ship to board: completed
Renaming constant SHOT => MISS
Tests green. Sandi singing out.
added possible test for the game class