Create Session reference

Property	Description
Widget configuration	The script that sets the parameters of this session.
Joining Session ()	Select Add + to specify the UnityEvent that occurs when a user attempts to join a specific session.
Joined Session (ISession)	Select Add + to specify the UnityEvent that occurs when a user is in a session.
Failed To Join Session (SessionException)	Select Add + to specify the UnityEvent that occurs when a user can't join a session because of an error.