Backend: Implementation of the Forget Password Functionality

[oguzhantok]

Users shall be able to reset their passwords with the help of the "Forget Password" functionality.

Two endpoints will be implemented:

• Users can give their email address as a input to the backend. After sending a request with the email as a input, backend application will send a email to the users mail address. In this email a code exists. Using this code with the next service users can reset their password.

• Users give their code which they gain from email sent to the application. This code ensures the security of the functionality.

Endpoints:

POST /api/user/forget_password POST /api/user/reset_password

[oguzhantok]

Implementation is finished! See related PR