Write user stories for feature "Biometric authentication"

[kholmukhamedovme]

As an administrator, I want to set the biometric authentication for the coordinators.

Notes:

• biometrics used for authentication is speaker identification/recognition.
• the administrator can choose (and modify later) either biometric authentication will be used as an additional step or as an alternative method for authenticating the coordinators.

[kholmukhamedovme]

As an administrator, I have to authenticate by biometric authentication.

Notes:

• in other words, biometric authentication is mandatory for administrator.
• biometrics used for authentication is speaker identification/recognition.