Hello @Salah Kalbi
You will need to create a family group for your Microsoft account and each user will need their own Microsoft account. Once the family group is created you then simply need to login to the PC as the user you want to share the game with and open the Microsoft Store to download the game. Each user will have their own game saves and, as mentioned, can play simultaneously.
You can refer to the following link for more information.
Sharing Windows 10 Store Apps with your Family
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Best Regards
Karlie