Develop Tournament model in main application.
Attach Tournament model to Django admin.

On branch dev
	new file:   main/admin.py
	new file:   main/migrations/0001_initial.py
	new file:   main/migrations/__init__.py
	modified:   main/models.py
Develop tables Player and TournamentResult for store players data for differends tournaments.

On branch dev
	modified:   main/admin.py
	new file:   main/migrations/0002_auto__add_player.py
	new file:   main/migrations/0003_auto__add_tournamentresult__add_unique_tournamentresult_tournament_pla.py
	modified:   main/models.py