Add a waiting room upon creation or connection to a new room. In this room, the user will wait for the other player to join the room and choose the game to play.

See the associated Trello card here.

Add the possibility to display an error below a field and display what's wrong. Make it generic.

Examples :

• "This username is already taken."

A router is necessary to navigate in the web app. For now, everything is under the <App/> component, and the navigation is counter-intuitive.

Once #3 is finished, the message components must be added dynamically in the chatbox.