Read up on TouchID

Read up on TouchID, before we begin to implement fingerprint authentication classes.

[resource 1](https://proandroiddev.com/5-steps-to-implement-biometric-authentication-in-android-dbeb825aeee8?gi=24b5389b117c)
[resource 2](https://www.androidauthority.com/how-to-add-fingerprint-authentication-to-your-android-app-747304/)

- [ ] Karthik
- [ ] Matilda