how much did victor confide to his friend clerval about bringing the creature to life?

Victor confided nothing in his friend. 

While walking in town, Frankenstein sees his dear friend Henry Clerval alight from a carriage; overjoyed, he immediately forgets his own misfortunes. Clerval's father has at last permitted him to study at Ingolstadt; the two old friends shall therefore be permanently reunited. Henry tells Victor that his family is wracked with worry since they hear from him so rarely. He exclaims over Frankenstein's unhealthy appearance; Victor, however, refuses to discuss the details of his project.