Запрос на слияние 'game-work' (#1) из game-work в master

fix: guard empty freeCells and reset spawn timer on game end

docs: describe rules and controls

feat: implement defect spawning, scoring and integrity

feat: add game screens and museum styles

refactor: fix review comments

feat: add game logic (script.js)

feat: add style.css

feat: add index.html

Update: README.md

Update: TASK.md