implement the buttons functionality:
- for the Update & New contacts will be created a new page viewerPanel that will be added in the stackedWidget of the Contact screen. If the modifications won't be saved, they will be discharged.
-for the "create email" button: a new page "Create email" will be created. The page will contain as a member the list of contact (read only mode). This page will support all the operations for creation of an email: save in draft etc.