-> add column to Tbl_user (encrypted masterPW)
-> add method in Databasehelper for updating encrypted masterPW in Tbl_user
-> add switch to layout Settings.xml for enabling biometric authentication
-> create method in Settings.java for encrypting masterPW
-> add column to Tbl_user (encrypted masterPW) -> add method in Databasehelper for updating encrypted masterPW in Tbl_user -> add switch to layout Settings.xml for enabling biometric authentication -> create method in Settings.java for encrypting masterPW