Project: react
Task (challenging): 1) Add pages/Game.tsx with text 'Hello Game'. 2) Add router.tsx in to control the Route Logic: When browser location is '/', routed to App. When browser location is '/game', routed to Game. 3) Add a appealing button with text '🎮' in App's Header.tsx to jump to Game page, and user can go back to App when browser page go Back. 4) Constraint: DO NOT use any third-party packages; ONLY React APIs are permitted.