Minesweeper

この issue には説明がありません。

The issue title 'Minesweeper' suggests implementing the game, but the body is empty. Look at the repository's existing exercises to understand the expected structure and format. Determine if this is a new exercise to be added to a specific directory, and check for any test files or instructions that define the game's requirements.

索引モデルが issue の本文から書いたものです。