minesweeper works, add save function
fix save, add emoji display
Add 'day1/' from commit 'db87e6b6defe9b1bb2912a9a2405ec3eb3b2bf02'

git-subtree-dir: day1
git-subtree-mainline: 31e32421ce69ee9ada3d862c07b3632c8216db01
git-subtree-split: db87e6b6defe9b1bb2912a9a2405ec3eb3b2bf02
Added minesweeper