Create API endpoint POST /api/v1/games

[siemieniuk]

Implement API endpoint (in file src/routers/api.py) which will react to POST /api/v1/games with JSON

{
	‘room_name’: <str>,
	‘max_players’: <int>,
	`password`: <str?>,
}

Where “max_players” is limited to values 2-6

If success, append a new room to the imported object "game_manager" (method add_new_game), then return JSON with a status code 200 (Ok):

{
	‘room_name’: <str>,
	‘max_players’: <int>,
	‘password’: <str?>
}

If the room exists with a specific name, return JSON with a status code 403 (Forbidden):

{
	‘message’: “The room {room_name} already exists”
}