[Feature] Login information should be retrievable in case of forgotten pw or email

[hunnihundert]

⚠️ Is your feature request related to a problem? Please describe

If the user forgets his/her password (or email address), there should be possibility of retrievable

💡 Describe the solution you'd like

Password reset function, which requires you to enter your registered email. Email confirmation for password reset will then be sent out.
If there is a neccesity for email retrieval, an option in which you have to enter, for example, phone no. and first/last name to show you stared out email address (like max.mus*****@gm****.c**) might be a possibility.

Other platforms involved

• iOS
• Backend