Implement user addition in UserService online_chat.py #824
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"Add: Implemented 'add_user' method in UserService
Added the 'add_user' method to UserService for creating new users. This method checks for existing user IDs and creates a User object with the provided details, storing it in the 'users_by_id' dictionary. The implementation ensures uniqueness of user IDs and enables seamless addition of new users to the system. "