add task solution

[KolomietsN]

DEMO LINK

[VitaliyBondarenko1982]

Good job.
In comment i wanted to show example how we can refactor and reduce amount of code.

[VitaliyBondarenko1982]

Suggested change

	function moveLeft() {
	for (let i = 0; i < numRows; i++) {
	const leftShift = matrix[i];
	const filteredRow = move(leftShift);
	matrix[i] = filteredRow;
	updateBoard();
	}
	}
	function moveRight() {
	for (let i = 0; i < numRows; i++) {
	const rightShift = [...matrix[i]].reverse();
	const filteredRow = move(rightShift);
	matrix[i] = filteredRow.reverse();
	updateBoard();
	}
	}
	function moveHorizontally(direction = 'left') {
	const isLeft = direction === 'left';
	for (let i = 0; i < numRows; i++) {
	const shift = isLeft ? matrix[i] : [...matrix[i]].reverse();
	const filteredRow = move(shift);
	matrix[i] = isLeft ? filteredRow : filteredRow.reverse();
	updateBoard();
	}
	}

this two function has almost same logic. we can combine them in one function something like that