Project: mobx
Task (challenging): Write a Gomoku chess game in route: '/game'
1) Add a button with the text '🎮' in Header, when clicked, jump to new page '/game'
2) chess board is 15*15, there is black chess and white chess, black chess first 
3) Add the className for important element: white chess(.chess-white), black chess(.chess-black), position chess can be clicked to drop follow regex: .chess-pos-\\d{1,2}-d\\{1,2}. 
4) show 'White's Turn' and 'Black'Turn' to shw current player 
5) show 'White Wins!' and 'Black Wins!'.
6) Use MobX to manage the game logic. Beautify this game 
Constraint: DO NOT use any third-party packages; ONLY React/MobX APIs are permitted.