[#11] feature: model and repository of creating game

[teds-lin]

實作以下部份並且新增相關測試案例：

• Domain models

  • Game
    -add_players()
    • 玩家人數限制為2~4人
    • bind Player instances to specific Game instance
  • id , identifier could be generated in UUID v4 format
  • assign_character(), 僅紀錄目前哪些調查員已被選擇，具體那個玩家選擇那個調查員由Player class紀錄

• Player

  • 紀錄選擇那個調查員

• In-memory repository

  • InMemoryRepository.save()
    • Using hash table to store key (game ID) value (relevant Game instance) pairs
    • Provide thread-safe access to the in-memory games dictionary

[metalalive]

Ted thanks for the code, the domain models look good,
I have questions about in-memory repository , and left my review comments at files changed tab, please take a look, thanks

c.c. @wingtkw , If you'd like to learn the code in this PR, please leave comments at here or in GitHub Discussion

[metalalive]

Looks good to me, thanks again